Bag of Holding
Wondrous item, uncommon · 2014 rules, SRD 5.1
Interior space 64 cubic feet, holds up to 500 lb; bag always weighs 15 lb. Action to retrieve an item. Overloaded/pierced: ruptures. Placing it in another extradimensional space opens a rift to the Astral Plane.
Also in the 2024 rules (SRD 5.2).