On the inventory screen, if you click the gear icon, and then "Deposit All Collectibles", some stuff from your inventory will disappear.
I think the idea is that it will automatically send such items to your bank without having to make a trip there. Is this true?
What happens if your bank is full? I've been depositing copper ore this way, and now that I've finally had a chance to visit the bank, I don't see any copper ore there. Is it gone forever?