Summarized List: Status Effects
A creature has this status as long as the items it's carrying exceed its maximum carry weight.
As long as a creature is carrying more than its maximum carry weight, its speed is reduced by half, it has disadvantage on reflex saves, and any failed Strength, Dexterity, or Constitution-based check causes Exhaustion 1.
If a creature is carrying more than twice its maximum carry weight, it becomes incapacitated until it drops some of all of its items.
This effect is removed as soon as an affected creature is no longer carrying more than its limit, or another effect increases the creature's carry weight.