I just got a Wingnut Hydra last night. I think I'll like it better than a Camelbak, because it sits much lower, and I can reach the two mesh pockets and two of the zippered pockets without taking it off. I'm gonna use it when we do route safety for the Breast Cancer 3-Day - we're on our bikes from about 5am until the last walker is in each night (6pm) so I need to carry lots of stuff each day. I can't wait to try it out!