hey,

there are some ways to dupe items with the backpacks if you have a high ping on the server.
For example you right click in the air and click again on a barrel. It will open the backpack and place it in to the barrel. This doesn't work with a low ping as you have not enough time to click twice.

There are few other ways with the same issue which I don't want to make public here as it can get abused.

This is important: The gui opens, then the backpack is placed into the barrel. Does the bag also remain in the players hand?

No, the bag goes in to the barrel and only the gui stays.

what?

Steps to reproduce:

[censored]

Patched with 2efea53