This is similar to #101 but it's a way that items get deleted when they get put in the second backpack
How to reproduce
You need 2 backpacks
Step 1, wear backpack. it doesn't need anything in it or whatever its just there.
Step 2: open backpack(not being worn) and move it to a different slot
Step 3: put item inside
step 4: Exit inventory.
Step 5: Open backpack (not being worn) and see that the item is gone