CamelBak's innovative Antidote Lumber Reservoir ensures easy hydration. Its polyurethane reservoir features laser-welded seams for incredible strength with minimal weight. A wide mouth-opening makes filling, cleaning, and adding ice simple, while the quarter-turn cap seals with a click and re-opens effortlessly. An internal center baffle distributes fluid and weight evenly. Camelbak’s Quick Link system has an auto-shut off mechanism so you can disconnect the hose for hassle-free refills.