Lighten up and stay hydrated. wherever adventure calls. The Hydrobak Light carries a 1.5-liter Crux Reservoir with Quicklink disconnect. plus an extra 1-liter of cargo space for basic essentials so you can carry on. Designed with lightweight and durable materials. the streamlined silhouette features an Air Support Light Back Panel and a ventilated harness for cooling and breathability. Additional external features include helmet carry. light loop and reflective detailing for added safety. Have peace of mind with a secure zippered pocket for keys. phone. or tools. and enjoy extended comfort with the adjustable sternum strap.