The osprey raptor 10 is an integrated hydration pack that comes supplied with 3 litre resevoir which is ideal for the long days in the saddle the reservoir is accessed via an asymmetric zip for quick and easy refills the reservoir also 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 wandering hose issue with competitor designs by placing a magnet in the pack sternum strap