It says that it resembles a Bag of Holding, so if you are a DM, you could say something like "You found what looks like a Bag of Holding" and when they discover what it truly is, they will be devastated because they put all their stuff in it. (I think I would be too evil to be DM...)

I want to make a Warlock with a Bag of Devouring as his patron. :)

Disposing corpses. Use it as an improvised weapon. If there is a small item you don't trust on your plane then you can space it onto a random one.

The most messed up thing about this Magic Item is that its Intentionally designed to look like a Bag of Holding!

How much does it weigh!?

Quote from jackiscool231 >>

you get one chance to escape when you willingly get inside it so you almost certainly die

Campaign idea.

A village sends the party n search of a lost bag of devouring,.

The party finds the bag and is requested to bring it to Dodrotir Woodbucket, the local garbage man. The garbage man uses the bag of devouring and slides it a the end of a funnel that receives the towns trash and water waste. 

The town uses the bag as a waste disposal and profit from it by accepting the other village waste for a fee.

The party decided ow ethical it is to do so.

Or the DM can give it to the players and watch the chaos unfold, especially when the dumbest character immediately reaches inside.

Quote from ASCIInerd73 >>

Quote from Vilheim_Slayer_of_Dragoons >>

Why would anybody use this???

If you sneak up behind a tiny or small enemy, then you can stuff them inside the bag of devouring and watch as they're instantly eaten. It's a convenient way of destroying demiliches.

 no you arn't thinking big enough. if a big monster throws a punch at you, you can shove their hand in it and the bag of devouring monster will eat off the hand

edit: i thought of this idea long ago but now that i've read the description of the bag of devouring it would be more like "a big monster throws a punch at you, you shove their hand in the  bag of devouring and watch as they get sucked into the bag leaving nothing behind"

little fact if you have pact of the great old one you can make the bag of holding monster be your patron(i don't know why but i keep on thinking the bag of devouring monster is really dumb)

Quote from Ozylanthe >>

items put in it are dumped on another plane. lost, not destroyed. 

 it's a mouth to a cosmic monster

Quote from Septicemic >>

Quote from shao_lung >>

My first DM once told me about a game he was in where a bag of devouring was turned inside out. What resulted was the emergence of a multi headed beast kind of like a hydra but with bags over all of its heads.

 Bag of Beholdering

 10/10 best joke i've ever read, best comment

Quote from ZestyVentricle >>

Would this destroy a legendary magical item or artifact?  RAW, it seems it would, but that seems like a really simple and lame workaround to destroy something like the Wand or Orcus, Hand of Vecna, or Book of Exalted Deeds.  I think I'd make the item reappear on another plane or something.

  Bag of Devouring monster:*distant crunching sounds*

if you fail your DC 15 Str check, the rest of the people in your group have a round of initiative to pull you out before you are dead.

Does this cause the same portal to the Astral plane event if a creature who is sucked into it was holding a Bag of Holding? From the BoH description: "Placing a bag of holding inside an extradimensional space created by a handy haversack, portable hole, or similar item instantly destroys both items and opens a gate to the Astral Plane. The gate originates where the one item was placed inside the other. Any creature within 10 feet of the gate is sucked through it to a random location on the Astral Plane. The gate then closes. The gate is one-way only and can't be reopened."

Quote from vilheim_the_adventurer >>

Why would anybody use this???

 Because you can kill Tiamat with it. Just watch Blaine Simple’s video on killing Tiamat at level 1.

I'm going to try turning invisible and slamming this down on the head of my enemy from above

I could imagine  some sort of quest in which the party has to babysit the Bag (feed it, etc.)

Quote from TeamSapphire >>

It says that it resembles a Bag of Holding, so if you are a DM, you could say something like "You found what looks like a Bag of Holding" and when they discover what it truly is, they will be devastated because they put all their stuff in it. (I think I would be too evil to be DM...)

 Nope, doing that is how you teach your players not to steal from commoners (evil DM laughter)