World of Warcraft Banking
Characters can only carry a certain amount of items on their person using their standard inventory slots and bags. However with crafting playing an integral part in the game, your inventory can get full with all sorts of quest items and reagents. So how do you get around this problem? The solution is simple.

How do I get an account?
Each of the 6 major capital cities in the game has a bank and these are usually found in a central location within the city, such as the Trade District in Stormwind. Despite being called a bank, you don't actually store any money there, the bank is purely for item storage and if you have played Diablo II before, the word Stash comes to mind. Money is always carried on your person and takes up no weight or space and cannot be stored in the bank. Also, money cannot be lost because players do not lose money or even any experience points through death. [Alright, you have to pay equipment repair costs but that is a seperate issue. See Death System.]

In addition to the 6 major cities in the world, banks can also be found in the neutral towns of Booty Bay, Ratchet and Gadgetzan. Due to the usefulness of the banks, most trading and auctions actually take place in front of them.

How much will it cost me?
All players start with a 24-slot bank to store items when they start the game. It's free. However, you may purchase up to 6 bag slots where you can place bags to expand the size of your bank, so if you purchased 3 bank slots and placed 8-slot bags in all 3 of them, you will double your bank space. The costs are as follows:

1st slot = 10 Silver
2nd slot = 10 Gold
3rd slot = 25 Gold
4th slot = 50 Gold
6th slot = 100 Gold

Note that purchasing the slot merely opens up the slot for usage; you still have to find a bag to put in that slot, so placing larger bags in each slot is the best way to maximise your storage space in the bank. You can remove a bag from the slot if you wish, they're not bound there, however once a bag is placed in a slot it becomes soulbound so you can't trade it with another player.