JanSport Trail Series Big Bear 78 Backpack polyester Plastic frame Ergonomic S-curve shoulder strapswith Top-loading main compartment with compression hood and Large front panel sleeve for quick access to key items Sliding harness adjustment and HDPE framesheet with mono 6061 tubular stays with Dual side water bottle pockets Mesh wet/dry pocket with Daisy chain quick clip points and Side compression straps keep pack close to the body and manage the load Haul loop with Dual zippered pockets and Bungee compression with Ice axe loop Capacity:4803.8 cu in / 78.72L,Dimensions:32in h x 14in w x 11in d,Weight:3 lbs 12 oz / 1.7 kg,Fabric:600 Denier Polyester / 210 Boxcar Dobby Polyester