Board Thread:Questions and Answers/@comment-25159376-20140203143420/@comment-6529023-20140205132008

When I roleplay banks, I assume that all vaults are connected to one big storage unit, and when you access it through a clerk, they open a portal to it using a special key or password, similar to alch's idea.

On a separate note (pun alert), I might as well explain bank notes. When at a clerk, you can give your possessions to them in exchange for a note representing that item. the item is then put in the bank's "universal vault". you can then trade these notes with other people, and when they go to redeem that item, it'll be pulled from the universal vault.