The Osprey Viper 9L Hydration pack is a great riding partner, carrying your food, drink and tools in a safe and organised layout. The Viper 9L comes supplied with a 3L Hydraulics reservoir which is ideal for on the trail hydration. 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 have also solved the loose drinking hose issue by applying a magnet to the sternum strap of the bag and to the bite valve so that its secured down. This ensures quick access to fluids when you need them and also quick connection when not in use.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. The bag features reflective graphics and an LED light attachment to help keep you visible when cycling on the roads at night or when the weather turns for the worst.