This back pack/hydration system was with me on a lot of adventures in 2010. I never had any major complaints with the comfort, functionality, or overall performance of this pack at all. (See later on for my two big nits on the Raptor 10 below.) While nothing is perfect, I was pleasantly surprised at how well this pack did on rides. The Raptor 10 survived getting overstuffed, abused in mud, and totally drenched and came back with flying colors every time. For another detailed look at the Raptor 10, see my review here and Grannygear’s thoughts on other Raptor packs here.