diff --git a/assets/sfx/effects/cash.ogg b/assets/sfx/effects/cash.ogg
index 448a156..b3fbcda 100644
Binary files a/assets/sfx/effects/cash.ogg and b/assets/sfx/effects/cash.ogg differ
diff --git a/assets/sfx/ui/backpack_close.ogg b/assets/sfx/ui/backpack_close.ogg
new file mode 100644
index 0000000..5ae1505
Binary files /dev/null and b/assets/sfx/ui/backpack_close.ogg differ
diff --git a/assets/sfx/ui/backpack_open.ogg b/assets/sfx/ui/backpack_open.ogg
new file mode 100644
index 0000000..8f390da
Binary files /dev/null and b/assets/sfx/ui/backpack_open.ogg differ
diff --git a/assets/sfx/ui/selection.ogg b/assets/sfx/ui/selection.ogg
new file mode 100644
index 0000000..a2c6581
Binary files /dev/null and b/assets/sfx/ui/selection.ogg differ
diff --git a/src/backpack/backpack_ui.rs b/src/backpack/backpack_ui.rs
index 1a4258a..6eacd78 100644
--- a/src/backpack/backpack_ui.rs
+++ b/src/backpack/backpack_ui.rs
@@ -1,5 +1,5 @@
 use super::{BackbackSwapEvent, Backpack, BackpackHead};
-use crate::{GameState, heads_ui::HeadsImages, loading_assets::UIAssets};
+use crate::{GameState, heads_ui::HeadsImages, loading_assets::UIAssets, sounds::PlaySound};
 use bevy::prelude::*;
 
 static HEAD_SLOTS: usize = 5;
@@ -270,6 +270,7 @@ fn swap_head_inputs(
     let action = *trigger.event();
     if action == BackpackAction::OpenClose {
         state.open = !state.open;
+        commands.trigger(PlaySound::Backpack { open: state.open });
     }
 
     if !state.open {
@@ -290,6 +291,7 @@ fn swap_head_inputs(
     }
 
     if changed {
+        commands.trigger(PlaySound::Selection);
         sync(&backpack, &mut state);
     }
 }
diff --git a/src/heads_ui.rs b/src/heads_ui.rs
index 1dc375e..f737f08 100644
--- a/src/heads_ui.rs
+++ b/src/heads_ui.rs
@@ -3,6 +3,7 @@ use crate::{
     backpack::{BackbackSwapEvent, Backpack, BackpackHead},
     loading_assets::UIAssets,
     player::head_id_to_str,
+    sounds::PlaySound,
 };
 use bevy::prelude::*;
 
@@ -204,6 +205,7 @@ fn on_select_active_head(
         }
     }
 
+    commands.trigger(PlaySound::Selection);
     commands.trigger(HeadChanged(res.heads[res.current_slot].unwrap()));
 }
 
diff --git a/src/loading_assets.rs b/src/loading_assets.rs
index 8eba579..2ce80d2 100644
--- a/src/loading_assets.rs
+++ b/src/loading_assets.rs
@@ -16,6 +16,14 @@ pub struct AudioAssets {
     pub gate: Handle<AudioSource>,
     #[asset(path = "sfx/effects/cash.ogg")]
     pub cash: Handle<AudioSource>,
+    #[asset(path = "sfx/ui/selection.ogg")]
+    pub selection: Handle<AudioSource>,
+
+    #[asset(path = "sfx/ui/backpack_open.ogg")]
+    pub backpack_open: Handle<AudioSource>,
+    #[asset(path = "sfx/ui/backpack_close.ogg")]
+    pub backpack_close: Handle<AudioSource>,
+
     #[asset(path = "sfx/hit", collection(typed))]
     pub hit: Vec<Handle<AudioSource>>,
     #[asset(path = "sfx/heads", collection(mapped, typed))]
diff --git a/src/main.rs b/src/main.rs
index 40fd0cd..20af4b7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -133,7 +133,7 @@ fn music(assets: Res<AudioAssets>, mut commands: Commands) {
         AudioPlayer::new(assets.music.clone()),
         PlaybackSettings {
             mode: PlaybackMode::Loop,
-            volume: Volume::new(0.6),
+            volume: Volume::new(0.4),
             ..default()
         },
     ));
@@ -142,7 +142,7 @@ fn music(assets: Res<AudioAssets>, mut commands: Commands) {
         AudioPlayer::new(assets.ambient.clone()),
         PlaybackSettings {
             mode: PlaybackMode::Loop,
-            volume: Volume::new(1.),
+            volume: Volume::new(0.8),
             ..default()
         },
     ));
diff --git a/src/sounds.rs b/src/sounds.rs
index d33278b..34f69c0 100644
--- a/src/sounds.rs
+++ b/src/sounds.rs
@@ -8,6 +8,8 @@ pub enum PlaySound {
     Gun,
     Gate,
     CashCollect,
+    Selection,
+    Backpack { open: bool },
     Head(String),
 }
 
@@ -37,6 +39,14 @@ fn spawn_sounds(
         PlaySound::Gun => assets.gun.clone(),
         PlaySound::Gate => assets.gate.clone(),
         PlaySound::CashCollect => assets.cash.clone(),
+        PlaySound::Selection => assets.selection.clone(),
+        PlaySound::Backpack { open } => {
+            if *open {
+                assets.backpack_open.clone()
+            } else {
+                assets.backpack_close.clone()
+            }
+        }
         PlaySound::Head(name) => {
             let filename = format!("{}.ogg", name);
             assets