GREGORY INERTIA 18 H2O BACKPACKThe Inertia 18 feels minimal, but lets you bring along a spare layer, food, and a headlamp if things run late. The included 3D Hydro Reservoir hauls up to three liters of water to keep you hydrated all day long.FEATURESIncludes 3D Hydro quick drying, soft molded reservoir (3 Liter) with integrated drying hanger.Dedicated zippered hydration sleeve with SpeedClip hydration hangar for a one-handed, snap-and-go connection.Die-cut shoulder harness with magnetic sternum buckle and hose clip for the Drylock bite valve.Breathable die-cut backpanel and removable webbing hipbelt.Sunglass QuickStow system on shoulder harness for quick, secure and scratch-free access to your shades.Top zippered pocket with key clip and front zippered pocket with soft touch liner to protect valuable items.Front and dual side stretch mesh pockets for quick storage.Custom comfort-grip molded zipper pulls and molded webbing keepers for strap management.TECH SPECSFits Torso: 16" - 21" / 40.6 - 53.3cmWeight: 1.20lbs / 544gVolume: 18L / 915cu in. Max Carry Weight: 15lbs / 6.8kgPacked Dimensions: 20.1" x 10" x 6.5" / 51cm x 25.4cm x 16.5cmExternal Material: 100% NylonPack Body: 210D Honeycomb Cryptorip HD NylonPack Bottom: 420D High Density Nylon / 135D High Density PolyesterLining: 135D High Density Embossed PolyesterSuspension: Perforated CLPE Foam