Each character in the Elder Scrolls Online starts the game with 50 Inventory slots. The amount of useful objects is quite impressive, and pretty soon you will find out that you need more inventory space.Once you discover the first town, bring up your map, and mouse over the various icons and look for Marketplace (It is marked by a tilting scale on your map), where you will see the various types of merchants.
1)Visit a bag merchant at Marketplace where you can increase your inventory slots by 10, to a new maximum of 70, for 400 golds. The next maximum of 80 Inventory slots will cost you 2000 gold. The max number of inventory slots is 110.
2)You can store up to 60 items in the bank. Items placed in the bank are shared between all characters on that account.
3)Once you buy a horse (~ 17000 gold), depending on what you feed the horse, the horse will either get faster or it will be able to carry more inventory, and you will get additional inventory slots.