Beachbag of Holding

A stylish satchel that magically adheres to Glario's Maginificently Modular Beach Chair. Technology!
This pouch 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.