Bag of Permanent Holding

This bag has an interior space considerably larger than its outside dimensions, roughly 2 feet in diameter at the mouth and 4 feet deep. The bag can hold up to 500 pounds, not exceeding a volume of 64 cubic feet. The bag weighs 15 pounds, regardless of its contents. It looks like an ordinary zip-locked bag.

Placing a bag of permanent holding inside an extradimensional space created by a handy haversack, portable hole, or similar item instantly destroys the other item.

When a creature attempts to retrieve an item, the bag seals itself tightly, causing it to be impossible to retrieve any items. If a creature is shoved inside the bag, the bag seals itself to prevent the creature from entering.

This bag is often found in a Beholder with kleptophobia's lair, or in a bag full of teddy grahams who wish not to be eaten. 

Notes: Utility, Container