Osprey katari 3 hydration packa 3l hydration pack that comes with a lightweight, adjustable and rugged design including ospreys 2.5l hydraulics lt reservoir. The harness comes with the airscape mesh backpanel with a central ventilation channel which keeps your back cushioned and ventilated during your most intense activities. The pack comes with an additional 0.5l of additional and useful storage including an internal key clip and a zippered scratch free side pocket ideal for eyewear and electricals. Ospreys katari comes with a rugged 210d poly honeycomb construction which in anti abrasive and impact resistance.featurescomes with 2.5l hydraulics lt reservoirairscape mesh backpanel with central ventilation channeldual front mesh pocketsexternal hydration accessinternal hydration sleeveinternal key attachment clipled light attachment pointreflective graphicssternum strap buckle with magnetwebbing grab handlezippered scratch free side pocketweighs 0.33kg210d poly honeycomb constructiondimensions 41cm x 19cm x 15cmbuy osprey hydration systems from chain reaction cycles, the world's largest online bike store.