Bag of Otherworldly Bounty.

can only be create by a warlock after you Sacrifice 100gp and a non magical Bag.
you decide what it look like.

• you can make this bag a part of your body, as a second mouth,
• you gain an 5-foot-long tentacle to make an grappling attack that the creature is pulled inside the bag.
  A creature inside the bag can use its action to try to Escape with a successful DC 15 Strength check.
  Another creature can use its action to reach into the bag to pull a creature out, doing so with a successful DC 20 Strength check
  (provided it isn't pulled inside the bag first). Any creature that starts its turn inside the bag is devoured, its body destroyed.
• The bag has a 5 percent chance may contain an useful object for any given circumstances,(which the DM chooses.)
  If your find an useful object, you can't use this feature again for 7 days. Otherwise, you can use it again after you finish a Long Rest.
• The extradimensional creature attached to the bag can sense whatever is placed inside the bag.
  Animal or vegetable matter placed wholly in the bag is devoured and lost forever.
  Inanimate Objects can be stored in the bag, which can hold a 5 cubic feet of such material, the bag has the size of a pouch, but can open up to the size of an bagpack.
  anything contained within of intrest to your Patron. it random is transported to your Patron.
  If the bag is pierced or torn, it is destroyed, and anything contained within it is transported to your Patron.

in addition if you have the Pact of the Chain, you can make this bag a part of your Familiar.

Pact.
The bag can't be removed from you while you're attuned to it.
if you have multiple pact items, they count as a single magic item with regards to the number of magic items you can attune to.

Notes: Warlock