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);
     }