When you make a move while carrying weight you may be encumbered. If your weight carried is:
- Equal to or less than your load, you suffer no penalty
- Less than or equal to your load+2, you take -1 ongoing until you lighten your burden
- Greater than your load+2, you have a choice: drop at least 1 weight and roll at -1, or automatically fail
A PC’s load stat is determined by their class and Str. Being able to haul more is a clear benefit when trying to carry treasure out of a dungeon or just making sure you can bring along what you need.
This move only applies to things a person could walk around with and still act. Carrying a boulder on your back is not encumbrance—you can’t really act or move much with it. It affects what moves you can make appropriately in the fiction.