Originally Posted by
Oglok
The biggest bag is 20 slots. You can craft it if you are either Armorsmith, Leatherworker or a Tailor.
By adding another material to the recipe, you can make specialized bags, one for materials, one for armors and weapons, one to hide the stuf in it from vendors and one to put all the junk.
Don't forget to push the "Deposit all collectible" button very often to make space in your inventory, it will send every crafting material, pvp armor/weapon, pets etc... in their own slot in you bank.