Since camelbak launched the first mule in 1996 mountain bikers have been letting them know that it hits the sweet spot of size vs storage its lightweight but big enough to carry three litres of water and a days worth of snacks and gear over the years camelbak39s designers also added air channels to keep your back cool plus clever compartments for stashing tools keys and electronics antidote174 reservoir the antidote reservoir features a quarter turn easy openclose cap th