The versatile Osprey Viper 9 hydration pack is for the rider who wants a lightweight design without sacrificing any benefits. Intuitive design holds everything you need and keeps it all handy for when you need it. The tool organizer pocket has a designated place for your pump, multi-tool and tube, plus extra space for essentials. Not to mention that the key clip gives you the confidence to ride knowing your keys are safe and secure. Handy stash pocket, on top, is easily accessible for food, etc. A stretch mesh pocket on the shoulder strap provides an easy to access, secure place for storing a cell phone, MP3 player or energy gel flask. Innovative 2-liter Hydroform reservoir, with rigid back, can be easily stuffed into the pack single-handedly. Lidlock and blinker attachment provide safe external place for your helmet and light.