MSR Roost Pak . The perfect way to carry any trail side items to which you may need quick and easy access . The pak mounts conveniently to the front of any roost D-flector or to other MSR Paks and cases using the Universal Attachment System . 845 D Nylon fabrics with PU backing and plastifoam padding . Duraflex hardware and YKK zippers . 5 separate compartments . Universal Attachment System . Dimensions: 9.25"/23.5cm (H) X 5.75"/14.6cm (W) X 2.75"/7cm (D) . Vol: 146.3in3 / 2397cc . Dry weight: 0.4 lbs / 182 g . Universal Attachment System is compatible with all other MSR removable pak components