Bag of Weasels

This bag operates like a Bag of Holding, storing objects within an extradimesional space to be retrieved at a later point in time. However, this bag is Cursed.

Curse of Weasels

Any mundane or magical item (rarity Uncommon or lower) item placed into the bag is transformed into a Weasel. On retrieval of the item, the bad instead produces a neutral, unaligned Weasel. The weasel is considered to be an ordinary weasel, but may take on some physical or behavioral aspects of the object it represents. Magical Weasels still retain their magical capabilities. The user has no more control of the weasel than they would over a wild creature (subject to a Handle Animal Check).

If the bag is turned out, dumping all contents, the weasels scatter.

Weasels can be turned back into their original object forms by casting Remove Curse on the Weasel.

How Trader Joe came upon this item is exceptionally unclear, but not unusual.