|Bag of holding|
Source: Classic Treasures Revisited, pg(s). 4-9
A bag of holding is a magical bag containing an extradimensional space, allowing it to hold a larger volume than its dimensions should permit. There are several different types of bags of holding, with the more powerful bags able to hold a larger amount than the less powerful ones. It is possible to accidentally destroy a bag of holding either by overloading it or by physically piercing it. It is also possible to briefly keep a live creature within a bag of holding but if not removed quickly they will soon suffocate.
Like other extradimensional containers, a bag of holding ceases to work while in another extradimensional space, with the exception of a portable hole. A bag of holding can tear a planar rift or create a portal to the Astral Plane when combined with a portable hole, a process which destroys both items.