The average DnD character can hold a lot of stuff. Characters frequently lug around enormous items, but sometimes even the nicest DM will rule that what you’re trying to carry is too big. That’s when you need a Bag of Holding.
Bag of Holding
The Bag of Holding is a wondrous, uncommon item from the Player’s Handbook. Its primary purpose is to let you carry heavy and unwieldy objects. The total volume inside is 64 cubic feet. In total, the bag can hold up to 500lbs, even though it only weighs about 15lbs to carry.
There are some restrictions, though. The bag has a 2-foot diameter opening, so you must be able to get the item through that opening. Additionally, if the bag is torn or you overload it, everything spills out somewhere in the Astral Plane. If you put a breathing creature inside, it can survive for about 10 minutes before they start suffocating.
If you want to use the Bag of Holding as a small bomb or gateway to the Astral Plane, there is a way to do that, although it’s pretty drastic. Putting an item that creates an extradimensional space (like a Handy Haversack or Portable Hole) inside a Bag of Holding, or vice versa instantly destroys both things and creates a gate. Anyone within 10 feet of the gate is sucked through to the Astral Plane.