diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/communication/CustomListActionResultData.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/communication/CustomListActionResultData.kt
new file mode 100644
index 000000000000..441ddf1fc2c4
--- /dev/null
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/communication/CustomListActionResultData.kt
@@ -0,0 +1,53 @@
+package net.mullvad.mullvadvpn.compose.communication
+
+import android.os.Parcelable
+import kotlinx.parcelize.Parcelize
+import net.mullvad.mullvadvpn.lib.model.CustomListName
+
+sealed interface CustomListActionResultData : Parcelable {
+
+    sealed interface Success : CustomListActionResultData, Parcelable {
+        val undo: CustomListAction
+
+        @Parcelize
+        data class CreatedWithLocations(
+            val customListName: CustomListName,
+            val locationNames: List<String>,
+            override val undo: CustomListAction
+        ) : Success
+
+        @Parcelize
+        data class Deleted(
+            val customListName: CustomListName,
+            override val undo: CustomListAction.Create
+        ) : Success
+
+        @Parcelize
+        data class Renamed(
+            val newName: CustomListName,
+            override val undo: CustomListAction.Rename
+        ) : Success
+
+        @Parcelize
+        data class LocationAdded(
+            val customListName: CustomListName,
+            val locationName: String,
+            override val undo: CustomListAction
+        ) : Success
+
+        @Parcelize
+        data class LocationRemoved(
+            val customListName: CustomListName,
+            val locationName: String,
+            override val undo: CustomListAction
+        ) : Success
+
+        @Parcelize
+        data class LocationChanged(
+            val customListName: CustomListName,
+            override val undo: CustomListAction
+        ) : Success
+    }
+
+    @Parcelize data object GenericError : CustomListActionResultData
+}
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/communication/CustomListSuccess.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/communication/CustomListSuccess.kt
index d83cd4c76de8..3b6a30bf38ca 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/communication/CustomListSuccess.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/communication/CustomListSuccess.kt
@@ -1,9 +1,11 @@
 package net.mullvad.mullvadvpn.compose.communication
 
 import android.os.Parcelable
+import kotlinx.parcelize.IgnoredOnParcel
 import kotlinx.parcelize.Parcelize
 import net.mullvad.mullvadvpn.lib.model.CustomListId
 import net.mullvad.mullvadvpn.lib.model.CustomListName
+import net.mullvad.mullvadvpn.lib.model.GeoLocationId
 
 sealed interface CustomListSuccess : Parcelable {
     val undo: CustomListAction
@@ -31,6 +33,14 @@ data class Renamed(override val undo: CustomListAction.Rename) : CustomListSucce
 
 @Parcelize
 data class LocationsChanged(
+    val id: CustomListId,
     val name: CustomListName,
+    val locations: List<GeoLocationId>,
+    val oldLocations: List<GeoLocationId>,
+) : CustomListSuccess {
     override val undo: CustomListAction.UpdateLocations
-) : CustomListSuccess
+        get() = CustomListAction.UpdateLocations(id, oldLocations)
+
+    @IgnoredOnParcel val addedLocations = locations - oldLocations
+    @IgnoredOnParcel val removedLocations = oldLocations - locations
+}
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/CreateCustomListDialog.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/CreateCustomListDialog.kt
index db7f664e37b4..a94673ef454e 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/CreateCustomListDialog.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/CreateCustomListDialog.kt
@@ -23,7 +23,7 @@ import com.ramcosta.composedestinations.result.ResultBackNavigator
 import com.ramcosta.composedestinations.spec.DestinationStyle
 import net.mullvad.mullvadvpn.R
 import net.mullvad.mullvadvpn.compose.button.PrimaryButton
-import net.mullvad.mullvadvpn.compose.communication.Created
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.component.CustomListNameTextField
 import net.mullvad.mullvadvpn.compose.state.CreateCustomListUiState
 import net.mullvad.mullvadvpn.compose.test.CREATE_CUSTOM_LIST_DIALOG_INPUT_TEST_TAG
@@ -63,7 +63,7 @@ data class CreateCustomListNavArgs(val locationCode: GeoLocationId?)
 )
 fun CreateCustomList(
     navigator: DestinationsNavigator,
-    backNavigator: ResultBackNavigator<Created>,
+    backNavigator: ResultBackNavigator<CustomListActionResultData.Success.CreatedWithLocations>,
 ) {
     val vm: CreateCustomListDialogViewModel = koinViewModel()
     LaunchedEffect(key1 = Unit) {
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/DeleteCustomListConfirmationDialog.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/DeleteCustomListConfirmationDialog.kt
index 0f26bcbe4865..bf0cd4927785 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/DeleteCustomListConfirmationDialog.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/DeleteCustomListConfirmationDialog.kt
@@ -11,7 +11,7 @@ import com.ramcosta.composedestinations.annotation.RootGraph
 import com.ramcosta.composedestinations.result.ResultBackNavigator
 import com.ramcosta.composedestinations.spec.DestinationStyle
 import net.mullvad.mullvadvpn.R
-import net.mullvad.mullvadvpn.compose.communication.Deleted
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.state.DeleteCustomListUiState
 import net.mullvad.mullvadvpn.compose.util.LaunchedEffectCollect
 import net.mullvad.mullvadvpn.lib.model.CustomListId
@@ -39,7 +39,7 @@ data class DeleteCustomListNavArgs(val customListId: CustomListId, val name: Cus
     navArgs = DeleteCustomListNavArgs::class
 )
 fun DeleteCustomList(
-    navigator: ResultBackNavigator<Deleted>,
+    navigator: ResultBackNavigator<CustomListActionResultData.Success.Deleted>,
 ) {
     val viewModel: DeleteCustomListConfirmationViewModel = koinViewModel()
     val state by viewModel.uiState.collectAsStateWithLifecycle()
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/EditCustomListNameDialog.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/EditCustomListNameDialog.kt
index 3a6d234fc6b1..2b5c4372d05a 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/EditCustomListNameDialog.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/dialog/EditCustomListNameDialog.kt
@@ -17,7 +17,7 @@ import com.ramcosta.composedestinations.result.ResultBackNavigator
 import com.ramcosta.composedestinations.spec.DestinationStyle
 import net.mullvad.mullvadvpn.R
 import net.mullvad.mullvadvpn.compose.button.PrimaryButton
-import net.mullvad.mullvadvpn.compose.communication.Renamed
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.component.CustomListNameTextField
 import net.mullvad.mullvadvpn.compose.state.EditCustomListNameUiState
 import net.mullvad.mullvadvpn.compose.test.EDIT_CUSTOM_LIST_DIALOG_INPUT_TEST_TAG
@@ -50,7 +50,7 @@ data class EditCustomListNameNavArgs(
     navArgs = EditCustomListNameNavArgs::class
 )
 fun EditCustomListName(
-    backNavigator: ResultBackNavigator<Renamed>,
+    backNavigator: ResultBackNavigator<CustomListActionResultData.Success.Renamed>,
 ) {
     val vm: EditCustomListNameDialogViewModel = koinViewModel()
     LaunchedEffectCollect(vm.uiSideEffect) { sideEffect ->
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/CustomListLocationsScreen.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/CustomListLocationsScreen.kt
index cb3767784edb..54bdaacb4142 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/CustomListLocationsScreen.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/CustomListLocationsScreen.kt
@@ -1,6 +1,5 @@
 package net.mullvad.mullvadvpn.compose.screen
 
-import android.content.Context
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -13,16 +12,12 @@ import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.SnackbarDuration
-import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
@@ -35,10 +30,9 @@ import com.ramcosta.composedestinations.navigation.DestinationsNavigator
 import com.ramcosta.composedestinations.result.NavResult
 import com.ramcosta.composedestinations.result.ResultBackNavigator
 import com.ramcosta.composedestinations.result.ResultRecipient
-import kotlinx.coroutines.launch
 import net.mullvad.mullvadvpn.R
 import net.mullvad.mullvadvpn.compose.cell.CheckableRelayLocationCell
-import net.mullvad.mullvadvpn.compose.communication.LocationsChanged
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.component.LocationsEmptyText
 import net.mullvad.mullvadvpn.compose.component.MullvadCircularProgressIndicatorLarge
 import net.mullvad.mullvadvpn.compose.component.NavigateBackIconButton
@@ -52,7 +46,6 @@ import net.mullvad.mullvadvpn.compose.test.SAVE_BUTTON_TEST_TAG
 import net.mullvad.mullvadvpn.compose.textfield.SearchTextField
 import net.mullvad.mullvadvpn.compose.transitions.SlideInFromRightTransition
 import net.mullvad.mullvadvpn.compose.util.LaunchedEffectCollect
-import net.mullvad.mullvadvpn.compose.util.showSnackbarImmediately
 import net.mullvad.mullvadvpn.lib.model.CustomListId
 import net.mullvad.mullvadvpn.lib.model.RelayItem
 import net.mullvad.mullvadvpn.lib.theme.Dimens
@@ -79,7 +72,7 @@ data class CustomListLocationsNavArgs(
 )
 fun CustomListLocations(
     navigator: DestinationsNavigator,
-    backNavigator: ResultBackNavigator<LocationsChanged>,
+    backNavigator: ResultBackNavigator<CustomListActionResultData>,
     discardChangesResultRecipient: ResultRecipient<DiscardChangesDestination, Boolean>,
 ) {
     val customListsViewModel = koinViewModel<CustomListLocationsViewModel>()
@@ -95,27 +88,16 @@ fun CustomListLocations(
         }
     }
 
-    val snackbarHostState = remember { SnackbarHostState() }
-    val context: Context = LocalContext.current
     LaunchedEffectCollect(customListsViewModel.uiSideEffect) { sideEffect ->
         when (sideEffect) {
-            is CustomListLocationsSideEffect.ReturnWithResult ->
+            is CustomListLocationsSideEffect.ReturnWithResultData ->
                 backNavigator.navigateBack(result = sideEffect.result)
-            CustomListLocationsSideEffect.CloseScreen -> backNavigator.navigateBack()
-            CustomListLocationsSideEffect.Error ->
-                launch {
-                    snackbarHostState.showSnackbarImmediately(
-                        message = context.getString(R.string.error_occurred),
-                        duration = SnackbarDuration.Short
-                    )
-                }
         }
     }
 
     val state by customListsViewModel.uiState.collectAsStateWithLifecycle()
     CustomListLocationsScreen(
         state = state,
-        snackbarHostState = snackbarHostState,
         onSearchTermInput = customListsViewModel::onSearchTermInput,
         onSaveClick = customListsViewModel::save,
         onRelaySelectionClick = customListsViewModel::onRelaySelectionClick,
@@ -134,7 +116,6 @@ fun CustomListLocations(
 @Composable
 fun CustomListLocationsScreen(
     state: CustomListLocationsUiState,
-    snackbarHostState: SnackbarHostState = SnackbarHostState(),
     onSearchTermInput: (String) -> Unit = {},
     onSaveClick: () -> Unit = {},
     onRelaySelectionClick: (RelayItem.Location, selected: Boolean) -> Unit = { _, _ -> },
@@ -142,7 +123,6 @@ fun CustomListLocationsScreen(
     onBackClick: () -> Unit = {}
 ) {
     ScaffoldWithSmallTopBar(
-        snackbarHostState = snackbarHostState,
         appBarTitle =
             stringResource(
                 if (state.newList) {
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/CustomListsScreen.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/CustomListsScreen.kt
index 5b9f0d4cc1c1..8ca728ca4bae 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/CustomListsScreen.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/CustomListsScreen.kt
@@ -34,6 +34,7 @@ import com.ramcosta.composedestinations.result.ResultRecipient
 import kotlinx.coroutines.launch
 import net.mullvad.mullvadvpn.R
 import net.mullvad.mullvadvpn.compose.cell.NavigationComposeCell
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.communication.Deleted
 import net.mullvad.mullvadvpn.compose.component.MullvadCircularProgressIndicatorLarge
 import net.mullvad.mullvadvpn.compose.component.NavigateBackIconButton
@@ -63,7 +64,8 @@ private fun PreviewCustomListsScreen() {
 @Destination<RootGraph>(style = SlideInFromRightTransition::class)
 fun CustomLists(
     navigator: DestinationsNavigator,
-    editCustomListResultRecipient: ResultRecipient<EditCustomListDestination, Deleted>
+    editCustomListResultRecipient:
+        ResultRecipient<EditCustomListDestination, CustomListActionResultData.Success.Deleted>
 ) {
     val viewModel = koinViewModel<CustomListsViewModel>()
     val state by viewModel.uiState.collectAsStateWithLifecycle()
@@ -82,7 +84,7 @@ fun CustomLists(
                         message =
                             context.getString(
                                 R.string.delete_custom_list_message,
-                                result.value.name
+                                result.value.customListName
                             ),
                         actionLabel = context.getString(R.string.undo),
                         duration = SnackbarDuration.Long,
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/EditCustomListScreen.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/EditCustomListScreen.kt
index 365328ea939a..3bd6dc0ce105 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/EditCustomListScreen.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/EditCustomListScreen.kt
@@ -33,6 +33,7 @@ import com.ramcosta.composedestinations.result.ResultBackNavigator
 import com.ramcosta.composedestinations.result.ResultRecipient
 import net.mullvad.mullvadvpn.R
 import net.mullvad.mullvadvpn.compose.cell.TwoRowCell
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.communication.Deleted
 import net.mullvad.mullvadvpn.compose.component.MullvadCircularProgressIndicatorLarge
 import net.mullvad.mullvadvpn.compose.component.NavigateBackIconButton
@@ -83,8 +84,9 @@ data class EditCustomListNavArgs(val customListId: CustomListId)
 )
 fun EditCustomList(
     navigator: DestinationsNavigator,
-    backNavigator: ResultBackNavigator<Deleted>,
-    confirmDeleteListResultRecipient: ResultRecipient<DeleteCustomListDestination, Deleted>
+    backNavigator: ResultBackNavigator<CustomListActionResultData.Success.Deleted>,
+    confirmDeleteListResultRecipient:
+        ResultRecipient<DeleteCustomListDestination, CustomListActionResultData.Success.Deleted>
 ) {
     val viewModel = koinViewModel<EditCustomListViewModel>()
 
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/SelectLocationScreen.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/SelectLocationScreen.kt
index 8cca835f744d..422b7b58ee2f 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/SelectLocationScreen.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/SelectLocationScreen.kt
@@ -68,12 +68,8 @@ import net.mullvad.mullvadvpn.compose.cell.IconCell
 import net.mullvad.mullvadvpn.compose.cell.StatusRelayItemCell
 import net.mullvad.mullvadvpn.compose.cell.SwitchComposeSubtitleCell
 import net.mullvad.mullvadvpn.compose.cell.ThreeDotCell
-import net.mullvad.mullvadvpn.compose.communication.Created
 import net.mullvad.mullvadvpn.compose.communication.CustomListAction
-import net.mullvad.mullvadvpn.compose.communication.CustomListSuccess
-import net.mullvad.mullvadvpn.compose.communication.Deleted
-import net.mullvad.mullvadvpn.compose.communication.LocationsChanged
-import net.mullvad.mullvadvpn.compose.communication.Renamed
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.component.LocationsEmptyText
 import net.mullvad.mullvadvpn.compose.component.MullvadCircularProgressIndicatorLarge
 import net.mullvad.mullvadvpn.compose.component.MullvadModalBottomSheet
@@ -132,12 +128,17 @@ private fun PreviewSelectLocationScreen() {
 fun SelectLocation(
     navigator: DestinationsNavigator,
     backNavigator: ResultBackNavigator<Boolean>,
-    createCustomListDialogResultRecipient: ResultRecipient<CreateCustomListDestination, Created>,
+    createCustomListDialogResultRecipient:
+        ResultRecipient<
+            CreateCustomListDestination,
+            CustomListActionResultData.Success.CreatedWithLocations
+        >,
     editCustomListNameDialogResultRecipient:
-        ResultRecipient<EditCustomListNameDestination, Renamed>,
-    deleteCustomListDialogResultRecipient: ResultRecipient<DeleteCustomListDestination, Deleted>,
+        ResultRecipient<EditCustomListNameDestination, CustomListActionResultData.Success.Renamed>,
+    deleteCustomListDialogResultRecipient:
+        ResultRecipient<DeleteCustomListDestination, CustomListActionResultData.Success.Deleted>,
     updateCustomListResultRecipient:
-        ResultRecipient<CustomListLocationsDestination, LocationsChanged>
+        ResultRecipient<CustomListLocationsDestination, CustomListActionResultData>
 ) {
     val vm = koinViewModel<SelectLocationViewModel>()
     val state = vm.uiState.collectAsStateWithLifecycle()
@@ -147,22 +148,12 @@ fun SelectLocation(
     val lazyListState = rememberLazyListState()
     CollectSideEffectWithLifecycle(vm.uiSideEffect) {
         when (it) {
-            SelectLocationSideEffect.CloseScreen -> {
-                backNavigator.navigateBack(result = true)
-            }
-            is SelectLocationSideEffect.LocationAddedToCustomList ->
-                launch {
-                    snackbarHostState.showResultSnackbar(
-                        context = context,
-                        result = it.result,
-                        onUndo = vm::performAction
-                    )
-                }
-            is SelectLocationSideEffect.LocationRemovedFromCustomList ->
+            SelectLocationSideEffect.CloseScreen -> backNavigator.navigateBack(result = true)
+            is SelectLocationSideEffect.CustomListActionToast ->
                 launch {
                     snackbarHostState.showResultSnackbar(
                         context = context,
-                        result = it.result,
+                        result = it.resultData,
                         onUndo = vm::performAction
                     )
                 }
@@ -335,7 +326,7 @@ fun SelectLocationScreen(
 
                         itemsIndexed(
                             items = state.relayListItems,
-                            key = { index: Int, item: RelayListItem -> item.key },
+                            key = { _: Int, item: RelayListItem -> item.key },
                             contentType = { _, item -> item.contentType },
                             itemContent = { index: Int, listItem: RelayListItem ->
                                 Column(modifier = Modifier.animateItem()) {
@@ -834,30 +825,53 @@ private suspend fun LazyListState.animateScrollAndCentralizeItem(index: Int) {
 
 private suspend fun SnackbarHostState.showResultSnackbar(
     context: Context,
-    result: CustomListSuccess,
+    result: CustomListActionResultData,
     onUndo: (CustomListAction) -> Unit
 ) {
+
     showSnackbarImmediately(
         message = result.message(context),
-        actionLabel = context.getString(R.string.undo),
+        actionLabel =
+            if (result is CustomListActionResultData.Success) context.getString(R.string.undo)
+            else {
+                null
+            },
         duration = SnackbarDuration.Long,
-        onAction = { onUndo(result.undo) }
+        onAction = {
+            if (result is CustomListActionResultData.Success) {
+                onUndo(result.undo)
+            }
+        }
     )
 }
 
-private fun CustomListSuccess.message(context: Context): String =
+private fun CustomListActionResultData.message(context: Context): String =
     when (this) {
-        is Created ->
-            locationNames.firstOrNull()?.let { locationName ->
-                context.getString(R.string.location_was_added_to_list, locationName, name)
-            } ?: context.getString(R.string.locations_were_changed_for, name)
-        is Deleted -> context.getString(R.string.delete_custom_list_message, name)
-        is Renamed -> context.getString(R.string.name_was_changed_to, name)
-        is LocationsChanged -> context.getString(R.string.locations_were_changed_for, name)
+        is CustomListActionResultData.Success.CreatedWithLocations ->
+            if (locationNames.size == 1) {
+                context.getString(
+                    R.string.location_was_added_to_list,
+                    locationNames.first(),
+                    customListName
+                )
+            } else {
+                context.getString(R.string.create_custom_list_message, customListName)
+            }
+        is CustomListActionResultData.Success.Deleted ->
+            context.getString(R.string.delete_custom_list_message, customListName)
+        is CustomListActionResultData.Success.LocationAdded ->
+            context.getString(R.string.location_was_added_to_list, locationName, customListName)
+        is CustomListActionResultData.Success.LocationRemoved ->
+            context.getString(R.string.location_was_removed_from_list, locationName, customListName)
+        is CustomListActionResultData.Success.LocationChanged ->
+            context.getString(R.string.locations_were_changed_for, customListName)
+        is CustomListActionResultData.Success.Renamed ->
+            context.getString(R.string.name_was_changed_to, newName)
+        CustomListActionResultData.GenericError -> context.getString(R.string.error_occurred)
     }
 
 @Composable
-private fun <D : DestinationSpec, R : CustomListSuccess> ResultRecipient<D, R>
+private fun <D : DestinationSpec, R : CustomListActionResultData> ResultRecipient<D, R>
     .OnCustomListNavResult(
     snackbarHostState: SnackbarHostState,
     performAction: (action: CustomListAction) -> Unit
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/repository/RelayListRepository.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/repository/RelayListRepository.kt
index 7d9846c31bb9..ce41b57c4ca4 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/repository/RelayListRepository.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/repository/RelayListRepository.kt
@@ -11,11 +11,13 @@ import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import net.mullvad.mullvadvpn.lib.daemon.grpc.ManagementService
 import net.mullvad.mullvadvpn.lib.model.Constraint
+import net.mullvad.mullvadvpn.lib.model.GeoLocationId
 import net.mullvad.mullvadvpn.lib.model.PortRange
 import net.mullvad.mullvadvpn.lib.model.RelayItem
 import net.mullvad.mullvadvpn.lib.model.RelayItemId
 import net.mullvad.mullvadvpn.lib.model.WireguardConstraints
 import net.mullvad.mullvadvpn.lib.model.WireguardEndpointData
+import net.mullvad.mullvadvpn.relaylist.findByGeoLocationId
 
 class RelayListRepository(
     private val managementService: ManagementService,
@@ -49,5 +51,7 @@ class RelayListRepository(
     suspend fun updateSelectedWireguardConstraints(value: WireguardConstraints) =
         managementService.setWireguardConstraints(value)
 
+    fun find(geoLocationId: GeoLocationId) = relayList.value.findByGeoLocationId(geoLocationId)
+
     private fun defaultWireguardEndpointData() = WireguardEndpointData(emptyList())
 }
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/usecase/customlists/CustomListActionUseCase.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/usecase/customlists/CustomListActionUseCase.kt
index 354316793c45..a23a6c6de5c0 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/usecase/customlists/CustomListActionUseCase.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/usecase/customlists/CustomListActionUseCase.kt
@@ -107,8 +107,10 @@ class CustomListActionUseCase(
             .mapLeft(UpdateLocationsError::UpdateLocations)
             .bind()
         LocationsChanged(
+            id = action.id,
             name = customList.name,
-            undo = action.not(locations = customList.locations)
+            locations = action.locations,
+            oldLocations = customList.locations,
         )
     }
 }
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/CreateCustomListDialogViewModel.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/CreateCustomListDialogViewModel.kt
index e367386bf265..5603ab41846c 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/CreateCustomListDialogViewModel.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/CreateCustomListDialogViewModel.kt
@@ -12,8 +12,8 @@ import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
-import net.mullvad.mullvadvpn.compose.communication.Created
 import net.mullvad.mullvadvpn.compose.communication.CustomListAction
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.state.CreateCustomListUiState
 import net.mullvad.mullvadvpn.lib.model.CustomListId
 import net.mullvad.mullvadvpn.lib.model.CustomListName
@@ -58,7 +58,13 @@ class CreateCustomListDialogViewModel(
                             )
                         } else {
                             _uiSideEffect.send(
-                                CreateCustomListDialogSideEffect.ReturnWithResult(it)
+                                CreateCustomListDialogSideEffect.ReturnWithResult(
+                                    CustomListActionResultData.Success.CreatedWithLocations(
+                                        customListName = it.name,
+                                        locationNames = it.locationNames,
+                                        undo = it.undo
+                                    )
+                                )
                             )
                         }
                     }
@@ -76,5 +82,7 @@ sealed interface CreateCustomListDialogSideEffect {
     data class NavigateToCustomListLocationsScreen(val customListId: CustomListId) :
         CreateCustomListDialogSideEffect
 
-    data class ReturnWithResult(val result: Created) : CreateCustomListDialogSideEffect
+    data class ReturnWithResult(
+        val result: CustomListActionResultData.Success.CreatedWithLocations
+    ) : CreateCustomListDialogSideEffect
 }
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/CustomListLocationsViewModel.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/CustomListLocationsViewModel.kt
index 7fa101a8e370..ffed0757b0ab 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/CustomListLocationsViewModel.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/CustomListLocationsViewModel.kt
@@ -3,6 +3,8 @@ package net.mullvad.mullvadvpn.viewmodel
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import arrow.core.getOrElse
+import arrow.core.raise.either
 import com.ramcosta.composedestinations.generated.destinations.CustomListLocationsDestination
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -16,6 +18,7 @@ import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import net.mullvad.mullvadvpn.compose.communication.CustomListAction
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.communication.LocationsChanged
 import net.mullvad.mullvadvpn.compose.state.CustomListLocationsUiState
 import net.mullvad.mullvadvpn.compose.state.RelayLocationListItem
@@ -87,7 +90,7 @@ class CustomListLocationsViewModel(
         viewModelScope.launch { fetchInitialSelectedLocations() }
     }
 
-    fun searchRelayListLocations() =
+    private fun searchRelayListLocations() =
         combine(
                 _searchTerm,
                 relayListRepository.relayList,
@@ -108,26 +111,23 @@ class CustomListLocationsViewModel(
     fun save() {
         viewModelScope.launch {
             _selectedLocations.value?.let { selectedLocations ->
-                customListActionUseCase(
-                        CustomListAction.UpdateLocations(
-                            navArgs.customListId,
-                            selectedLocations.calculateLocationsToSave().map { it.id }
-                        )
-                    )
-                    .fold(
-                        { _uiSideEffect.tryEmit(CustomListLocationsSideEffect.Error) },
-                        {
-                            _uiSideEffect.tryEmit(
-                                // This is so that we don't show a snackbar after returning to the
-                                // select location screen
-                                if (navArgs.newList) {
-                                    CustomListLocationsSideEffect.CloseScreen
-                                } else {
-                                    CustomListLocationsSideEffect.ReturnWithResult(it)
-                                }
-                            )
+                val locationsToSave = selectedLocations.calculateLocationsToSave()
+                val result =
+                    either {
+                            val success =
+                                customListActionUseCase(
+                                        CustomListAction.UpdateLocations(
+                                            navArgs.customListId,
+                                            locationsToSave.map { it.id }
+                                        )
+                                    )
+                                    .bind()
+                            calculateResultData(success, locationsToSave)
                         }
-                    )
+                        .getOrElse { CustomListActionResultData.GenericError }
+                _uiSideEffect.tryEmit(
+                    CustomListLocationsSideEffect.ReturnWithResultData(result = result)
+                )
             }
         }
     }
@@ -241,7 +241,7 @@ class CustomListLocationsViewModel(
         isExpanded: (RelayItemId) -> Boolean,
         depth: Int = 0,
     ): List<RelayLocationListItem> = flatMap { relayItem ->
-        buildList<RelayLocationListItem> {
+        buildList {
             val expanded = isExpanded(relayItem.id)
             add(
                 RelayLocationListItem(
@@ -277,15 +277,45 @@ class CustomListLocationsViewModel(
         }
     }
 
+    private fun calculateResultData(
+        success: LocationsChanged,
+        locationsToSave: List<RelayItem.Location>
+    ) =
+        if (navArgs.newList) {
+            CustomListActionResultData.Success.CreatedWithLocations(
+                customListName = success.name,
+                locationNames = locationsToSave.map { it.name },
+                undo = CustomListAction.Delete(id = success.id)
+            )
+        } else {
+            when {
+                success.addedLocations.size == 1 && success.removedLocations.isEmpty() ->
+                    CustomListActionResultData.Success.LocationAdded(
+                        customListName = success.name,
+                        relayListRepository.find(success.removedLocations.first())!!.name,
+                        undo = success.undo
+                    )
+                success.removedLocations.size == 1 && success.addedLocations.isEmpty() ->
+                    CustomListActionResultData.Success.LocationRemoved(
+                        customListName = success.name,
+                        locationName =
+                            relayListRepository.find(success.removedLocations.first())!!.name,
+                        undo = success.undo
+                    )
+                else ->
+                    CustomListActionResultData.Success.LocationChanged(
+                        customListName = success.name,
+                        undo = success.undo
+                    )
+            }
+        }
+
     companion object {
         private const val EMPTY_SEARCH_TERM = ""
     }
 }
 
 sealed interface CustomListLocationsSideEffect {
-    data object CloseScreen : CustomListLocationsSideEffect
-
-    data class ReturnWithResult(val result: LocationsChanged) : CustomListLocationsSideEffect
-
-    data object Error : CustomListLocationsSideEffect
+    data class ReturnWithResultData(val result: CustomListActionResultData) :
+        CustomListLocationsSideEffect
 }
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/DeleteCustomListConfirmationViewModel.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/DeleteCustomListConfirmationViewModel.kt
index c492bd368a30..cdb0327d1643 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/DeleteCustomListConfirmationViewModel.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/DeleteCustomListConfirmationViewModel.kt
@@ -12,7 +12,7 @@ import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import net.mullvad.mullvadvpn.compose.communication.CustomListAction
-import net.mullvad.mullvadvpn.compose.communication.Deleted
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.state.DeleteCustomListUiState
 import net.mullvad.mullvadvpn.lib.model.CustomListId
 import net.mullvad.mullvadvpn.lib.model.CustomListName
@@ -49,7 +49,12 @@ class DeleteCustomListConfirmationViewModel(
                     { _error.tryEmit(it) },
                     {
                         _uiSideEffect.send(
-                            DeleteCustomListConfirmationSideEffect.ReturnWithResult(it)
+                            DeleteCustomListConfirmationSideEffect.ReturnWithResult(
+                                CustomListActionResultData.Success.Deleted(
+                                    customListName = it.name,
+                                    undo = it.undo
+                                )
+                            )
                         )
                     }
                 )
@@ -58,5 +63,6 @@ class DeleteCustomListConfirmationViewModel(
 }
 
 sealed interface DeleteCustomListConfirmationSideEffect {
-    data class ReturnWithResult(val result: Deleted) : DeleteCustomListConfirmationSideEffect
+    data class ReturnWithResult(val result: CustomListActionResultData.Success.Deleted) :
+        DeleteCustomListConfirmationSideEffect
 }
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/EditCustomListNameDialogViewModel.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/EditCustomListNameDialogViewModel.kt
index 0b71a5053ead..c4825be9b710 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/EditCustomListNameDialogViewModel.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/EditCustomListNameDialogViewModel.kt
@@ -13,7 +13,7 @@ import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import net.mullvad.mullvadvpn.compose.communication.CustomListAction
-import net.mullvad.mullvadvpn.compose.communication.Renamed
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.state.EditCustomListNameUiState
 import net.mullvad.mullvadvpn.lib.model.CustomListName
 import net.mullvad.mullvadvpn.usecase.customlists.CustomListActionUseCase
@@ -52,7 +52,16 @@ class EditCustomListNameDialogViewModel(
                 )
                 .fold(
                     { _error.emit(it) },
-                    { _uiSideEffect.send(EditCustomListNameDialogSideEffect.ReturnWithResult(it)) }
+                    {
+                        _uiSideEffect.send(
+                            EditCustomListNameDialogSideEffect.ReturnWithResult(
+                                CustomListActionResultData.Success.Renamed(
+                                    newName = it.name,
+                                    undo = it.undo
+                                )
+                            )
+                        )
+                    }
                 )
         }
     }
@@ -64,5 +73,6 @@ class EditCustomListNameDialogViewModel(
 }
 
 sealed interface EditCustomListNameDialogSideEffect {
-    data class ReturnWithResult(val result: Renamed) : EditCustomListNameDialogSideEffect
+    data class ReturnWithResult(val result: CustomListActionResultData.Success.Renamed) :
+        EditCustomListNameDialogSideEffect
 }
diff --git a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/SelectLocationViewModel.kt b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/SelectLocationViewModel.kt
index f31fcb307840..a219bb976b77 100644
--- a/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/SelectLocationViewModel.kt
+++ b/android/app/src/main/kotlin/net/mullvad/mullvadvpn/viewmodel/SelectLocationViewModel.kt
@@ -2,6 +2,7 @@ package net.mullvad.mullvadvpn.viewmodel
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import arrow.core.getOrElse
 import arrow.core.raise.either
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -14,7 +15,7 @@ import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import net.mullvad.mullvadvpn.compose.communication.CustomListAction
-import net.mullvad.mullvadvpn.compose.communication.LocationsChanged
+import net.mullvad.mullvadvpn.compose.communication.CustomListActionResultData
 import net.mullvad.mullvadvpn.compose.state.FilterChip
 import net.mullvad.mullvadvpn.compose.state.RelayListItem
 import net.mullvad.mullvadvpn.compose.state.RelayListItem.CustomListHeader
@@ -44,7 +45,7 @@ import net.mullvad.mullvadvpn.usecase.customlists.FilterCustomListsRelayItemUseC
 class SelectLocationViewModel(
     private val relayListFilterRepository: RelayListFilterRepository,
     private val availableProvidersUseCase: AvailableProvidersUseCase,
-    private val customListsRelayItemUseCase: CustomListsRelayItemUseCase,
+    customListsRelayItemUseCase: CustomListsRelayItemUseCase,
     private val filteredCustomListRelayItemsUseCase: FilterCustomListsRelayItemUseCase,
     private val customListsRepository: CustomListsRepository,
     private val customListActionUseCase: CustomListActionUseCase,
@@ -79,8 +80,7 @@ class SelectLocationViewModel(
     val uiSideEffect = _uiSideEffect.receiveAsFlow()
 
     private fun initialExpand(): Set<String> = buildSet {
-        val item = relayListRepository.selectedLocation.value.getOrNull()
-        when (item) {
+        when (val item = relayListRepository.selectedLocation.value.getOrNull()) {
             is GeoLocationId.City -> {
                 add(item.country.code)
             }
@@ -131,7 +131,7 @@ class SelectLocationViewModel(
                             .size
                 }
 
-            buildList<FilterChip> {
+            buildList {
                 if (ownershipFilter != null) {
                     add(FilterChip.Ownership(ownershipFilter))
                 }
@@ -157,9 +157,10 @@ class SelectLocationViewModel(
                         searchTerm.length >= MIN_SEARCH_LENGTH,
                         selectedItem.getOrNull(),
                         filteredCustomLists,
-                        relayCountries,
-                        { it in expandedItems }
-                    )
+                        relayCountries
+                    ) {
+                        it in expandedItems
+                    }
                 if (relayItems.isEmpty()) {
                     add(RelayListItem.LocationsEmptyText(searchTerm))
                 } else {
@@ -201,7 +202,7 @@ class SelectLocationViewModel(
     ): List<RelayListItem> =
         customLists.flatMap { customList ->
             val expanded = isExpanded(customList.id.expandKey())
-            buildList<RelayListItem> {
+            buildList {
                 add(
                     RelayListItem.CustomListItem(
                         customList,
@@ -243,36 +244,35 @@ class SelectLocationViewModel(
         item: RelayItem.Location,
         depth: Int = 1,
         isExpanded: (String) -> Boolean,
-    ): List<RelayListItem.CustomListEntryItem> =
-        buildList<RelayListItem.CustomListEntryItem> {
-            val expanded = isExpanded(item.id.expandKey(parent))
-            add(
-                RelayListItem.CustomListEntryItem(
-                    parentId = parent,
-                    item = item,
-                    expanded = expanded,
-                    depth
-                )
+    ): List<RelayListItem.CustomListEntryItem> = buildList {
+        val expanded = isExpanded(item.id.expandKey(parent))
+        add(
+            RelayListItem.CustomListEntryItem(
+                parentId = parent,
+                item = item,
+                expanded = expanded,
+                depth
             )
+        )
 
-            if (expanded) {
-                when (item) {
-                    is RelayItem.Location.City ->
-                        addAll(
-                            item.relays.flatMap {
-                                createCustomListEntry(parent, it, depth + 1, isExpanded)
-                            }
-                        )
-                    is RelayItem.Location.Country ->
-                        addAll(
-                            item.cities.flatMap {
-                                createCustomListEntry(parent, it, depth + 1, isExpanded)
-                            }
-                        )
-                    is RelayItem.Location.Relay -> {} // No children to add
-                }
+        if (expanded) {
+            when (item) {
+                is RelayItem.Location.City ->
+                    addAll(
+                        item.relays.flatMap {
+                            createCustomListEntry(parent, it, depth + 1, isExpanded)
+                        }
+                    )
+                is RelayItem.Location.Country ->
+                    addAll(
+                        item.cities.flatMap {
+                            createCustomListEntry(parent, it, depth + 1, isExpanded)
+                        }
+                    )
+                is RelayItem.Location.Relay -> {} // No children to add
             }
         }
+    }
 
     private fun createGeoLocationEntry(
         item: RelayItem.Location,
@@ -363,11 +363,28 @@ class SelectLocationViewModel(
         viewModelScope.launch {
             val newLocations =
                 (customList.locations + item).filter { it !in item.descendants() }.map { it.id }
-            customListActionUseCase(CustomListAction.UpdateLocations(customList.id, newLocations))
-                .fold(
-                    { _uiSideEffect.send(SelectLocationSideEffect.GenericError) },
-                    { _uiSideEffect.send(SelectLocationSideEffect.LocationAddedToCustomList(it)) },
-                )
+            val result =
+                customListActionUseCase(
+                        CustomListAction.UpdateLocations(customList.id, newLocations)
+                    )
+                    .fold(
+                        { CustomListActionResultData.GenericError },
+                        {
+                            if (it.removedLocations.isEmpty()) {
+                                CustomListActionResultData.Success.LocationAdded(
+                                    customListName = it.name,
+                                    locationName = item.name,
+                                    undo = it.undo
+                                )
+                            } else {
+                                CustomListActionResultData.Success.LocationChanged(
+                                    customListName = it.name,
+                                    undo = it.undo
+                                )
+                            }
+                        },
+                    )
+            _uiSideEffect.send(SelectLocationSideEffect.CustomListActionToast(result))
         }
     }
 
@@ -382,17 +399,26 @@ class SelectLocationViewModel(
                         val customList =
                             customListsRepository.getCustomListById(customListId).bind()
                         val newLocations = (customList.locations - item.id)
-
-                        customListActionUseCase(
-                                CustomListAction.UpdateLocations(customList.id, newLocations)
+                        val success =
+                            customListActionUseCase(
+                                    CustomListAction.UpdateLocations(customList.id, newLocations)
+                                )
+                                .bind()
+                        if (success.addedLocations.isEmpty()) {
+                            CustomListActionResultData.Success.LocationRemoved(
+                                customListName = success.name,
+                                locationName = item.name,
+                                undo = success.undo
+                            )
+                        } else {
+                            CustomListActionResultData.Success.LocationChanged(
+                                customListName = success.name,
+                                undo = success.undo
                             )
-                            .bind()
+                        }
                     }
-                    .fold(
-                        { SelectLocationSideEffect.GenericError },
-                        { SelectLocationSideEffect.LocationRemovedFromCustomList(it) }
-                    )
-            _uiSideEffect.send(result)
+                    .getOrElse { CustomListActionResultData.GenericError }
+            _uiSideEffect.send(SelectLocationSideEffect.CustomListActionToast(result))
         }
     }
 
@@ -404,9 +430,8 @@ class SelectLocationViewModel(
 sealed interface SelectLocationSideEffect {
     data object CloseScreen : SelectLocationSideEffect
 
-    data class LocationAddedToCustomList(val result: LocationsChanged) : SelectLocationSideEffect
-
-    class LocationRemovedFromCustomList(val result: LocationsChanged) : SelectLocationSideEffect
+    data class CustomListActionToast(val resultData: CustomListActionResultData) :
+        SelectLocationSideEffect
 
     data object GenericError : SelectLocationSideEffect
 }