Osprey raven 10 hydration packfeaturing a womens specific fit the raven 10 and integrated 3 litre hydraulics reservoir ensure that you can carry all the required gear and liquid to perform your personal best keep hydrated on the toughest of rides with easy access to the reservoir 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 ospre