David Schroffwrote a review of CamelBak M.U.L.E. Hydration Pack - 580cu in on July 20, 2013
Familiarity: I've used it several times
Use it for biking & hiking - excellent pack. The helmet area is great all kinds of stuff - jackets, hats, etc. and there are plenty of pockets for bike tools, snacks, phone and other gear plus you have 100 oz water capacity.