Carrying the essentials shouldnt feel like a chore. With the Osprey Viper 13 you have the ideal way to carry all the required gear & hydration for a full days riding without bulk, in the perfect comfort. The integrated Hydraulics reservoir is accessible via an asymmetric zip which allows quick & easy refills while a unique hydrostatic plate helps the reservoir maintain an anatomical shape without loosing water pressure so you have a comfortable pack that fits combined with a smooth flow of water. The Viper 13 has also solved the wandering hose problem with a combination of magnets that hold the bite valve in place on the sternum strap when not needed. Ospreys ventilated back panel uses proven foam ventilated straps for excellent cooling in hot weather. The additional Bio Stretch technology in the straps help them hug your body for a secure & comfortable fit while still featuring the flexibility needed for movement without restriction. Storage wise, the Osprey Viper 13 Hydration Pack has you covered for anything. Inside the pack gear & tools are easily organised & carried within their own quick access compartments while a front compression pocket is perfect for bulky items. This front pocket also features a drainage hole so you can carry your wet gear without the need to get your pack wet inside. Lower compression straps ensure the load remains secure & doesnt affect your riding performance by moving around on your back. Ospreys unique Lid Lock attachment provides a quick & secure attachment point for your helmet without taking up space inside the pack. An additional touch for night time riding is the addition of reflective graphics & an LED light attachment to keep you safe & seen when your reflective gear is covered by the pack.