Juice Packs are interactive quest items in Dead Island. In Act I, the player is tasked by John Sinamoi with driving to a gas station to retrieve some for the survivors at the lifeguard station in the quest Seek'n'Loot.
Carrying a box of juice slows the player and prevents them from attacking with any carried weaponry, though they can be thrown at enemies to knock them over and inflict some damage.
A total of four packages will fit in the back of the pickup bed, but only two are required to complete the quest. These appear at the back of the garage at the lifeguard station upon completion.