Camelbak Crux Quick Link Lumbar Reservoir Kit Description: The Camelbak Crux Quick Link Lumbar Reservoir Kit is designed to efficiently provide fluids in a smaller, lighter reservoir for when you need more water than a waterbottle but don't want/need to haul around 3 liters of water. The main reservoir and hose utilize Camelbak's HydroGuard antimicrobial technology to eliminate unwanted odors and flavors, and a free flowing (but leak free!) BigBite drink valve ensures rapid flow of fluids when they are most needed. Rounding out the features is a large opening that has a remarkably low profile that will make it easy to fill and clean the bladder, and the end of the hose has an on/off valve to make sure none of the valuable contents leak out. Features: HydroGuard antimicrobial technology prevents odors, discoloration, and deterioration of interior reservoir and tubing surfaces Thin, low profile fill port with oversized opening and Air-Light Tritan cap makes it easy to fill and clean out the bladder, and a Quick-Snap cap featuring an ergonomic handle creates a water tight seal and locks in place with only 1/4 of a turn Crux PureFlow tubing along with a no-leak BigBite drink valve for a free flowing design to rapidly quench a thirst On/off Quick Link valve locks down to prevent leaks when in the off position, and yet allows impressive flow when in the open position 1.5L bladder size intended for lumbar style packs but size will fit into wide range of sizes and shapes of bags and packs