diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/Slimefun.java b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/Slimefun.java
index 1be851ba17..9e8289fa37 100644
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/Slimefun.java
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/Slimefun.java
@@ -14,6 +14,7 @@
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
+import io.github.thebusybiscuit.slimefun4.implementation.listeners.BundlingListener;
 import io.github.thebusybiscuit.slimefun4.storage.Storage;
 import io.github.thebusybiscuit.slimefun4.storage.backend.legacy.LegacyStorage;
 
@@ -655,6 +656,7 @@ private void registerListeners() {
         new PiglinListener(this);
         new SmithingTableListener(this);
         new JoinListener(this);
+        new BundlingListener(this);
 
         // Item-specific Listeners
         new CoolerListener(this, (Cooler) SlimefunItems.COOLER.getItem());
diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/backpacks/SlimefunBackpack.java b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/backpacks/SlimefunBackpack.java
index 4f2a0e3500..61bbdb8e83 100644
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/backpacks/SlimefunBackpack.java
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/backpacks/SlimefunBackpack.java
@@ -69,6 +69,11 @@ public boolean isItemAllowed(@Nonnull ItemStack item, @Nullable SlimefunItem ite
             return false;
         }
 
+        // Bundles aren't allowed either
+        if (SlimefunTag.BUNDLES.isTagged(item.getType())) {
+            return false;
+        }
+
         return !(itemAsSlimefunItem instanceof SlimefunBackpack);
     }
 
diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/listeners/BundlingListener.java b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/listeners/BundlingListener.java
new file mode 100644
index 0000000000..29baa3ca4d
--- /dev/null
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/listeners/BundlingListener.java
@@ -0,0 +1,64 @@
+package io.github.thebusybiscuit.slimefun4.implementation.listeners;
+
+import io.github.thebusybiscuit.slimefun4.api.items.SlimefunItem;
+import io.github.thebusybiscuit.slimefun4.implementation.Slimefun;
+import io.github.thebusybiscuit.slimefun4.implementation.items.backpacks.SlimefunBackpack;
+import io.github.thebusybiscuit.slimefun4.utils.tags.SlimefunTag;
+import org.bukkit.Material;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.inventory.ItemStack;
+
+import javax.annotation.Nonnull;
+
+public class BundlingListener implements Listener {
+    public BundlingListener(@Nonnull Slimefun plugin) {
+        plugin.getServer().getPluginManager().registerEvents(this, plugin);
+    }
+
+    @EventHandler(ignoreCancelled = true)
+    public void onBundling(InventoryClickEvent event) {
+        ItemStack cursor = event.getCursor();
+        ItemStack slot = event.getCurrentItem();
+
+        if (slot == null || cursor.isEmpty()) {
+            return;
+        }
+
+        if (isBundle(cursor) && isBackpack(slot) || isBundle(slot) && isBackpack(cursor)) {
+            event.setCancelled(true);
+        }
+    }
+
+    @EventHandler(ignoreCancelled = true)
+    public void onCreativeBundle(InventoryClickEvent event) {
+        ItemStack cursor = event.getCursor();
+        ItemStack slot = event.getCurrentItem();
+
+        if (slot == null || cursor.isEmpty()) {
+            return;
+        }
+
+        if (isBundle(cursor) && isBackpack(slot) || isBundle(slot) && isBackpack(cursor)) {
+            event.setCancelled(true);
+        }
+    }
+
+    private boolean isBundle(ItemStack stack) {
+        return SlimefunTag.BUNDLES.isTagged(stack.getType());
+    }
+
+    private boolean isBackpack(ItemStack stack) {
+        if (stack.getType() != Material.PLAYER_HEAD) {
+            return false;
+        }
+
+        SlimefunItem backpack = SlimefunItem.getByItem(stack);
+        if (backpack == null) {
+            return false;
+        }
+
+        return backpack instanceof SlimefunBackpack;
+    }
+}
diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/utils/tags/SlimefunTag.java b/src/main/java/io/github/thebusybiscuit/slimefun4/utils/tags/SlimefunTag.java
index 7eab9b680f..d33c932f88 100644
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/utils/tags/SlimefunTag.java
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/utils/tags/SlimefunTag.java
@@ -277,7 +277,12 @@ public enum SlimefunTag implements Tag<Material> {
     /**
      * All tile entities.
      */
-    TILE_ENTITIES;
+    TILE_ENTITIES,
+
+    /**
+     * All bundles.
+     */
+    BUNDLES;
 
     /**
      * Lookup table for tag names.
diff --git a/src/main/resources/tags/bundles.json b/src/main/resources/tags/bundles.json
new file mode 100644
index 0000000000..68c929fcc4
--- /dev/null
+++ b/src/main/resources/tags/bundles.json
@@ -0,0 +1,72 @@
+{
+  "values": [
+    {
+      "id": "minecraft:bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:white_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:orange_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:magenta_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:light_blue_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:yellow_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:lime_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:pink_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:gray_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:light_gray_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:cyan_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:purple_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:blue_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:brown_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:green_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:red_bundle",
+      "required": false
+    },
+    {
+      "id": "minecraft:black_bundle",
+      "required": false
+    }
+  ]
+}
\ No newline at end of file