I bought the classic pack and noticed that at the base of the mountain I was drinking water and at the summit I was drinking slush. Get this to keep the flow going and to prevent your bite nozzle from icing over.
This pack is perfect. It holds just enough and is just the right size. It fits great under my jacket on the mountain and cuts down on the frequency of lodge visits, so I can spend more time riding. If youre search for hydration, is like goldilocks and the three bearsthis pack is just right (not too small or large and too expensive or cheap).