Consumable items are different from other item types in two ways. First, most consumable items may be stacked, allowing duplicates items to occupy the same item slot up to a cap. Secondly, consumable items may be expended to perform a specific function, permanently removing that item from the champion's inventory.
Consumable items generally provide no benefit until consumed, functioning as an activated item effect. Consumable items are primarily focused on either gaining map control through the use of wards or boosting a champion’s statistics for a brief period with potions and elixers. Consuming an item will either destroy it or consume a charge, similar to stock abilities.