The osprey raven 10l hydration pack is a womens specific backpack that comes with a 3l reservoir and is ideal for the longer 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 sternum strap a