When training riding skills for my characters I like to max out Speed first and then start Capacity as only one skill option is available to upgrade each day. Visit a Stable Master each day to purchase the Capacity upgrade which will add 1 slot per day over 60 days at the cost of 250g per upgrade.
The cost to upgrade your bag space from the Pack Merchant is as follows: Bag Space You can find a Pack Merchant in most major cities where you will be able to purchase additional space. Once you have reached level 12, if you have not already upgraded your inventory slots you will receive a free upgrade of 10 slots, pushing you to 70 spaces, a 400g savings. Inventory or is managed on a per character basis in ESO, each of your characters start out with 60 bag spaces at level 1. In this quick-guide you will learn how to upgrade your bags and bank with more inventory storage and the cost to do so. Managing inventory in the Elder Scrolls Online can be overwhelming when you are a new player just starting out.