Weight

Every item in RuneScape has a weight, which can affect the users in his/her gameplay. Players can see the total weight of the items they have equipped or are carrying in their inventory on the "Equipment Stats" screen. It's measured in kilograms (kg). Many items weigh with a fraction but the Equipment Stats screen will round it to the nearest kilogram. The weight affects the player's energy time, but the Agility skill helps overcome this. As far as energy drain rate is concerned, having negative weight is the same as having 0 kg of weight. Some activities in RuneScape require players to not weigh more than a certain amount. Example: diving off Port Khazard during and after Recipe for Disaster (Pirate Pete subquest); a part in Temple of Ikov requires players to have negative weight.

Stackable items such as runes and coins and other items do not weigh. Some items also reduce weight instead of adding, which is very useful for quests or activities that require a ton of running.

Items that reduce weight

 * Spottier cape


 * Spotted cape


 * Boots of lightness


 * Penance gloves

Wearing a combination of only a Spottier cape, Boots of lightness, and Penance gloves, a player is able to achieve a weight of -13 kg, the lowest possible weight in the game.

Weighing
Since some items' weights which have fractions are rounded off in the Equipment Stats screen, it's hard to tell the real weight. Fortunately, someone has found out a set of items with different weights to help find out. They also are not hard to find.