Add the possibility to craft a booby trap, which you can place inside of the Inventory, so that everybody who gets into the Inventory, except the owner, activates it and blows that thing off.
It may be crafted by combine rope + handgrenade + backpack; rope + handgrenade + persistent box (when its ingame); rope + handgrenade + vehicle (when its ingame)
By activation, there will be 3-5 sec to disamble it or throw it away, before it explode. Only hint for a booby trap inside an Inventory may be a played sound, like the popping of splint and bracket.