Leakproof and Durable: The exterior of Maelstrom lunch box is made of waterproof nylon fabric, which is lightweight and wear-resistant. Expandable & Foldable: With a reinforced zipper, top compartment of Maelstrom expandable lunch box can be easily expanded with a simple zipper action. Unique Design: Maelstrom lunch cooler bag has the reinforced bone to make the bag stand upright, so you don??t worry this loncheras para hombres will be wrinkled. Multi-pockets: There is a zipper mesh bag on the inside of the cover. This large lunch box has two side pockets. Multiple Carrying Choices: Detachable and adjustable straps, comfortable handle allow you to hold Maelstrom women lunch bag by hand or shoulder.