Bag of Banking

This heavy cloth string draw bag bears a stitching of a golden crossed keys. The interior appears perfectly ordinary, yet when an object is dropped inside, it vanishes without sound. 

Secure Deposit (Passive). When you place a nonliving object weighing no more than 200 pounds into the bag, it is instantly transported to a linked secure vault located on a demiplane warded against scrying and planar travel. The object cannot be retrieved through the bag. The vault can store up to 2,000 pounds of material in total. If this limit is exceeded, the bag refuses to accept additional items.

Withdrawal Protocol (1/Long Rest). As an action, you can speak the bag’s command word and summon one specific item you previously deposited or any amount of coins. The item appears in your hands or at your feet.