Bottomless Backpack

This well-worn leather backpack appears ordinary from the outside, but its interior opens into an extradimensional space far larger than any mundane pack. It can hold up to 500 pounds of material, not exceeding a volume of 64 cubic feet. The backpack weighs 15 pounds, regardless of its contents. Retrieving an item from the backpack requires a swift action. If the backpack is destroyed, its contents are scattered across the Astral Plane.