The Camelbak M.u.l.e. 100 Oz Hydration Pack has everything you need, and nothing you dont. The M.U.L.E.® has a narrow-gauge design that keeps it light and maneuverable- so even when its fully loaded for a day of mountain biking, it wont get in your way. The latest edition is built around the brand new Crux reservoir, which is even easier to load and refill, and delivers more water with every sip. Its lightWeight, but big enough to carry three liters of water and a days worth of snacks and gear. It also sports added air channels to keep your back cool, universal helmet hooks, and clever compartments for stashing tools, keys and electronics. The latest version also features a magnetic tube trap that snaps easily into place, so you can hydrate without taking your eyes off the trail.