Tyranny of Dragons
Bag of Holding
Wondrous Item, Uncommon
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. Retrieving an item from the bag requires an action.
Source: Dungeon Master’s Guide, page 153