http://tinyurl.com/lwrfp9fOsprey Packs Syncro 20 Hydration Pack with ReservoirProduct Review Click on the link for more reviewsWell-appointed daypack comes with three-liter HydraForm reservoir to keep you hydrated on the trailFeatures AirSpeed suspension system, with mesh back panel supported by LightWire frame and BioStretch ventilated harnessSyncro hip belt uses padded spacer mesh hip wings with straight ErgoPull hip belt for a custom, well-supported fitIntegrated rain cover stows away when not in use; measures 10.6 by 18.5 by 7.9 inches (W x H x D)Includes limited lifetime manufacturer's warranty