heavy vinyl coated nylon which is water resistant and also very resistant to abrasion. The bottom is made from molded polymer plastic which gives additional water resistance. The 2" web handles wrap completely around the bag. There is a weather flap that covers the top of the bag to keep water out. Box "X" stitches on the handles prevent tearing. Available with one or two large outside pockets. Pockets are covered with a flap with snap fasteners. This bag also has a shoulder strap.