I’m having issues with GUI procedures. I’m trying to prevent a backpack from being put in a backpack

I’ve tried a handful of procedures and lines of code, even went to ChatGPT to have it write Code (It didn’t do anything lol)

Anyways if someone could help make a simple procedure for my issue that would be appreciated.

By the way there’s a leather Backpack, Iron Backpack, and Obsidian Backpack. None of them should be able to be stored inside each other.

Edit: Starting to question wether this was the right forum, sorry if it wasn’t there were a lot of options