The Zol Medium Waist Bag with Bottle Opener. We have upgraded our best-selling waist bag, with a patent-pending invention and a useful bottle opener inserted into our waist strap. This innovation will make your fanny pack an essential item. Perfect for cycling tours, trekking, traveling, and the beach. We recommend the Medium Waist Bag with Bottle Opener to fit more essentials. One year warranty directly with manufacturer.