The Osprey Viper 13L Hydration Pack is the ideal all round backpack that you can use for a long ride on the weekend or a quick commute to work.The Viper 13 and integrated 2.5 litre Hydraulics reservoir ensures that you can carry all the required gear and liquid to perform your best. The reservoir is accessed via an asymmetric zip for quick and easy refills. The reservoir incorporates a unique hydrostatic plate that maintains an anatomical shape but also keeps water pressure high for a smooth delivery of water. Osprey also solved the ‘wandering hose’ issue with competitors designs by placing a magnet in the pack sternum strap and bite valve. This holds everything neatly in place when not needed; yet ensuring quick and easy access when it is. The ventilated foam back panel and harness keep you cool in hot conditions whilst still offering flexibility for movement without restriction. The unique LidLock attachment provides a quick and secure attachment point for your helmet without taking up space inside your pack. Gear and bike tools are easily organised and carried within the quick access internal compartments. The front compression pocket complete with drainage hole, provides an ideal space for bulky additional items or used as a handy place to stash wet items on the go. Lower side compression means that your load is secure over the roughest of terrain. Reflective graphics and LED light attachment help to keep you visible for when the weather turns or night falls.