Bag
From Vintage Story Wiki
A bag is an item that allows players to expand their carry capacity. Bags are carried in a special section of the hotbar, and players can equip up to four bags simultaneously. Several different types of bags are available with a variety of slots.
Creation
All bags must be crafted by players in the crafting grid.
Types
Usage
Bags must be placed in a bag slot in the hotbar for them to take effect. They automatically provide more carrying slots in the inventory screen.