This bag is made of PVC material with welded seams and Features roll-top closure to keep your items dry in rainy days. It can be used as a duffel bag, shoulder bag, and bike rear seat bag for different needs. The 20L large capacity makes it a great bag for commuting, cycling, kayaking, boating, and other outdoor sports. Features: High-quality PVC material and welded seams, waterproof and durable. Roll-top closure with buckle for enhanced protection to keep your valuables dry. Reflective accents ensure nighttime visibility for safer riding. Nonslip handles and removable shoulder strap for multiple carrying styles, can be used as a duffel bag or a shoulder bag. Comes with two fixing straps for mounting the bag firmly on the bicycle rack. Two elastic straps for expanding the exterior capacity of the bag. 20L large capacity, great for cycling, gym fitness, rafting, boating, kayaking, commuting, etc. Specifications: Material: PVC Color: Black / Yellow (optional) Dimension: 46 * 23 * 28cm / 18.1 * 9.0 * 11.0in Weight: 0.65kg / 1.4lb Package List: 1 * Waterproof Duffel Bag