1. You must have bank space. (1 bank space is enough)
2. Get that item that you want to get to.
3. then Put it in the bank.
4. If the item will drop again then get the item in the bank and put it in you bag then accept the item then you have it.
it's useful for doing boost like exp, rep etc. . .
Hope it will help for you specially in leveling. . .