The tactical backpack is built with adjustable shoulder, chest, and waist straps, plus MOLLE webbing on 3 sides equipped with an assortment of unshielded MOLLE pouches. The exterior is made with an extremely durable and waterproof 500D PVC with welded seams and two layers of high-shielding Fabric on all interior sides of the faraday compartment. Used for shielding large electronic devices during travel, in the rain, snow, sand, near contaminants, and anywhere near water. The large 40-liter capacity can accommodate numerous devices, such as laptops, batteries, tablets, cell phones, radios, GPS units, and additional accessories and gear.  If you like this powerful waterproof backpack, please feel free to contact us. We have ten years of bag manufacturing experience in China, and will customize your bags according to your needs.