diff --git a/packages/nixpak/amberol/default.nix b/packages/nixpak/amberol/default.nix
index 36af8dd..dc270b1 100644
--- a/packages/nixpak/amberol/default.nix
+++ b/packages/nixpak/amberol/default.nix
@@ -1,7 +1,7 @@
 { mkNixPak, callPackage }:
 
 mkNixPak {
-  config = {
+  config = { sloth, ... }: {
     imports = [ ../modules/gui-base.nix ];
     dbus.policies = {
       "org.mpris.MediaPlayer2.*" = "own";
@@ -9,10 +9,10 @@ mkNixPak {
     flatpak.appId = "io.bassi.Amberol";
     bubblewrap = {
       bind.rw = [
-        "$HOME/.cache/amberol"
+        (sloth.concat' sloth.xdgCacheHome "/amberol")
       ];
       bind.ro = [
-        "$HOME/Music"
+        (sloth.concat' sloth.homeDir "/Music")
       ];
     };
     app.package = callPackage ./amberol.nix {};
diff --git a/packages/nixpak/fragments/default.nix b/packages/nixpak/fragments/default.nix
index 6fbb6f8..9073160 100644
--- a/packages/nixpak/fragments/default.nix
+++ b/packages/nixpak/fragments/default.nix
@@ -1,7 +1,7 @@
 { mkNixPak, fragments }:
 
 mkNixPak {
-  config = {
+  config = { sloth, ... }: {
     imports = [ ../modules/gui-base.nix ];
     flatpak.appId = "de.haeckerfelix.Fragments";
     app.package = fragments;
@@ -14,7 +14,7 @@ mkNixPak {
         "/etc/hosts"
       ];
       bind.rw = [
-        "$HOME/.config/fragments"
+        (sloth.concat' sloth.xdgConfigHome "/fragments")
       ];
     };
   };
diff --git a/packages/nixpak/modules/gui-base.nix b/packages/nixpak/modules/gui-base.nix
index fed5d45..480c099 100644
--- a/packages/nixpak/modules/gui-base.nix
+++ b/packages/nixpak/modules/gui-base.nix
@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, sloth, ... }:
 
 {
   config = {
@@ -18,18 +18,22 @@
     bubblewrap = {
       network = lib.mkDefault false;
       bind.rw = [
-        "$HOME/.cache/fontconfig"
-        "$HOME/.cache/mesa_shader_cache"
-        "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY"
-        "$XDG_RUNTIME_DIR/at-spi/bus"
-        "$XDG_RUNTIME_DIR/gvfsd"
-        "$XDG_RUNTIME_DIR/pulse"
+        (sloth.concat' sloth.xdgCacheHome "fontconfig")
+        (sloth.concat' sloth.xdgCacheHome "mesa_shader_cache")
+        (sloth.concat [
+          (sloth.env "XDG_RUNTIME_DIR")
+          "/"
+          (sloth.env "WAYLAND_DISPLAY")
+        ])
+        (sloth.concat' (sloth.env "XDG_RUNTIME_DIR") "/at-spi/bus")
+        (sloth.concat' (sloth.env "XDG_RUNTIME_DIR") "/gvfsd")
+        (sloth.concat' (sloth.env "XDG_RUNTIME_DIR") "/pulse")
       ];
       bind.ro = [
-        "$XDG_RUNTIME_DIR/doc"
-        "$HOME/.config/gtk-2.0"
-        "$HOME/.config/gtk-3.0"
-        "$HOME/.config/gtk-4.0"
+        (sloth.concat' (sloth.env "XDG_RUNTIME_DIR") "/doc")
+        (sloth.concat' sloth.xdgConfigHome "/gtk-2.0")
+        (sloth.concat' sloth.xdgConfigHome "/gtk-3.0")
+        (sloth.concat' sloth.xdgConfigHome "/gtk-4.0")
       ];
       env = {
         XDG_DATA_DIRS = lib.makeSearchPath "share" [