Storage boxes can be found in most towns and outposts throughout Haradon. They are used to store items not currently in use. Every player gets 24 slots (2 pages) to begin with, but you can purchase an extra 12 storage spaces for 10 gold. (Prices increase with each successive upgrade.) Storage boxes do not store any type of currency.
There are currently four upgrades available to the storage box, each giving an additional 12 slots: