Bank Bag

A bank bag is assigned to an account holder at a bank at the time of account opening. Bags can be replaced, but only one bag per account holder can be issued at a time. 

This innocuous looking leather satchel has a central pouch which is an extradimensional space. The backpack always weighs 5 pounds, regardless of its contents. The only thing capable of being put in the bag is currency. When anyone looks in the bag it appears empty.

Placing coin in the bank bag follows the normal rules for interacting with objects. Retrieving coin from the bank bag requires you to use an action. To make a withdrawal from your funds you only have to think of the amount you want and the denomination. As long as you have the funds available you magically pull the exact amount out. The ONLY people capable of making a withdrawal are those on the account the bag is assigned too. A disguise self spell and a deception check (DC25) convinces the bag you are an account holder. 

If a sharp object pierces the bank bag or tears it, it ruptures and is destroyed. if the bag catches on fire, it is destroyed. If the bank bag is destroyed, you must travel to a bank branch and purchase a replacement.

Placing the bank bag inside an extradimensional space created by a bag of holding, portable hole, or similar item instantly destroys both items and opens a gate. The gate originates where the one item was placed inside the other. Any creature within 10 feet of the gate is sucked through it and deposited. The gate then closes. The gate is one-way only and can't be reopened.

Notes: Utility, Container