User blog comment:Lunar Archivist/Borderlands 2 - Thereotically Unlimited Storage Space Glitch?/@comment-1729807-20121008102530/@comment-70.49.75.127-20121008105344

Well, that's the catch, as far as I can tell.

If you retrieve items by swapping them, then the bank vault stays "inflated". An item for an item, after all.

If you put retrieve an item from the bank vault by placing it into an empty slot, its size will decrease. Which makes sense. 70.49.75.127 10:53, October 8, 2012 (UTC)