The Inventory contains all items that you own. Besides equipment like armor, weapons, shields and horses, the inventory also holds your consumable (food) and non-consumable items (goods). There is no limit on weight, but a large amount of weight will reduce your party's speed. You can access your inventory at any time, except in combat, where you must activate the small chest near your flag.
The player inventory is the primary inventory used, only items in this inventory can be sold, traded or equipped. The inventory starts with 30 slots and is expandable via the inventory management skill (+6 slots per rank) to a maximum of 90 slots (30 + 60 at rank 10). All items that are bought or taken as loot after a battle are added to this inventory.
The battle chest, located at the foot of the banner near where you start a battle, can be accessed to change equipment. It contains the same items that are in the player inventory. Additional bolts or arrows can be accessed via this chest during battle, but horses cannot be switched.
Your household inventory appears in the keep of your owned castles and towns, it can be accessed directly or by talking to your spouse. You can store items you plan to use later but don't want to keep as a burden, it is also used to store food and goods when preparing to hold a feast.
When you open a productive enterprise you will have access to its warehouse inventory, which has a fixed size of 24 slots, and can only be accessed by visiting your enterprise. You can add items to it to be used in the next production cycle, potentially increasing revenue. If you tell your production manager to store produced items for you, they will be stored until retrieved by you. Each enterprise has its own separate inventory.