I once had a player that wanted a Decanter of Endless Water just to waterboard people 😳
Honestly if you wanna give your party a bag of holding, sticking it on a bugbear assassin who uses this tactic and then uses the bag to dispose of bodies is a fun way to introduce it.
Anything the players do, I be DM can do too, yt if it uses a niche magic item, the DM better be prepared for it to end up in the hands of the players.