Main compartment measures 18'' x 9 1/2'' x 5 1/2''. Approximate capacity 1400 cubic inches. Comfortable back padding and supple curvaceous straps supported by 1 1/4'' nylon webbing minimize the load on shoulders. Two side net pouches with cinch cord can be used to carry water bottles. lon thread (stronger than ordinary industry standard nylon thread). #AS-100 high grade closed-cell foam padding material for superior shock protection. High tensile strength nylon webbing. #10 high strength zippers and zipper tracks. UTX-Duraflex nylon buckles for low sound closures.