Weight

Your weight on Project RS06 is measured in Kg, and depends on objects you are weilding, and the objects in your inventory, different objects have different weights, for example, a mithril dagger will weigh less than a steel platebody. There are objects such as Boots of lightness that can reduce weight.

The higher your weight is, the faster your run energy lowers, and the slower it recovers, this is why, for skills such as runecrafting, it is important to have as low a weight as possible, making objects such as the Boots of lightness very useful.