rocky Mountain Unlimited Core 15 L Hiking Backpack Black NWTSPECIFICATIONSBackpanel 18.5 x 10Waist Size 22 - 44Weight 2.5 lbWaterproof Abrasion proof 420D Exterior Nylon Fabric. Interior 150D Polyester linerFEATURESDual Chest Straps Tension StrapsExterior Fleece Lined Valuables PocketExterior Helmet SlingDiagonal Ski CarryAluminium Perimeter Frame for Stability ComfortBreathable Backpanel With Perforated EVA Foam Troline Webbing Shoulder StrapsWater Reservoir CompatibleWaist-belt Water Bottle HolderRemovable Waist Belt For Seperate AdventuresLifetime Warranty