Had my first ride yesterday with the Viper 9. Easily moved all of my gear over from my old Deuter pack, i.e. tube, multitool, tire tool, CO2 pump and cartridges. My phone fit perfectly in the lined outer pocket, I didn't even use the largest storage pocket that is adjacent to the bladder compartment, but it would work nicely for snacks and some extra clothing. The reason I jumped on this deal was the removeable waist straps. I've never liked using those and have had to cut them off of other packs. Even with my gear and the 2.5L bladder filled 3/4 of the way, the pack felt empty. Way lighter and more comfortable than any pack I've ever used. The flimsy bladder and smaller fill hole will take some getting used to since my Deuter pack had a much thicker Source bladder with a huge fill opening. Hopefully the flimsy Osprey bladder will stand up to getting folded and stuffed into my freezer between rides, which is what I do to keep from having to wash it all the time.