I once had a player that wanted a Decanter of Endless Water just to waterboard people 😳
I think the screams would be muffled but still audible. Until the bag is closed, the extradimensional space inside is connected to the outside world. However, since sound can only escape from the opening and not the sides of the bag, I would rule that it is much quieter, granting disadvantage on checks to hear the scream.
It’s up to the DM if it comes across like a portal to enter the bag or an impossible space like the TARDIS. Air does not flow between as you can suffocate and air would carry the sound, but I always rule it as feeling more like in impossibly large space rather than a magical portal.
Idk, that feels a bit too technical. Trying to apply real world physics to D&D breaks way more things than just this, so we gotta be careful when to do it. Gotta keep just enough believability and consistency, without letting it ruin the feel.
For me, the fact that “starwars lasers go pew pew” is enough reason to disregard how sound actually works in real life, lol.
To be fair I’d just rule in favour of the players the first time it comes up. If they want it as a silencer with the prerequisite of putting it over someone’s head, that’s cool because the enemy will struggle and make it difficult.
If it’s debut was from an enemy doing it to a PC who said they’d yell extra hard to call for help, I’d probably ask for a skill check and say the sound does pass through.
From then on, I’d just keep that ruling.
I always interpreted the suffocation to be only while the bag is closed. It doesn’t make much sense if physical objects can enter the bag but not air. Why not?
Creating the bag would create a very big underpressure, immediately imploding the bag and probably killing the creator
