The amount that you can carry in Kingdom Come: Deliverance is determined by your carry weight capacity, the specific amount of which can be seen at the bottom of your inventory. You begin the game with around 76 capacity, but this can be increased beyond 200 with the appropriate combination of stat and perk investments. Even with a carry capacity of 200+, you will find yourself struggling to carry more than your basic armour, weapons and supplies, leaving space for only a small amount of loot. Fortunately, there are two ways in which you can store items, both on the go and at home.
Note: The main method to increase carry weight capacity is by working on your Strength skill which contributes to the amount you can carry with each increase in level. The easiest way to do this is by frequently fighting or sparring opponents. In addition, at Strength levels 4, 8 and 12 you will be able to invest in the perks Mule I, Mule II and Mule III which increase carry weight capacity by 15, 20 and 25 respectively.
The horse inventory is the most convenient way to store items that you might require in the wilderness, such as alternative armour and weapon builds or additional food supplies. The carry weight capacity of a horse is much greater than your own, able to be increased well beyond 400 with the Heavy Duty Pony perk and upgrades in saddlebags. In addition you can visit horse traders to purchase a new horse with superior carry weight capacity. The horse inventory offers the added bonus of being able to access its contents without the need for the horse to be by your side. It is also especially useful in situations where you have a lot of poached meat or bandit / Cuman armour to carry away and sell.
Home chests are not portable in the same way that the Horse Inventory is, but they have their own benefits in the form of an unlimited carry weight capacity and shared storage between them. This means that wherever Henry owns a bed in the world, the chest beside it will carry the same items as every other chest that he owns, including chests located in temporary accommodation such as lodgings. Home chests are particularly useful for storing items that you are likely to use only in settlements such as fancy clothes, books, keys and herbs.
Note: It is worth checking your inventory on a regular basis for any unnecessary items that might be needlessly contributing to your overall carry weight. The most common culprits include stackable items such as repair kits, arrows, potions and herbs.