Features: 840D nylon material with waterproof TPU coating, wear-resistant and easy to clean; welded seams for enhanced durability. Roll-top design with quick-release buckles keep all your gears dry in rainy days. Reflective elements for increased visibility and safety when riding at night. Elastic bungee cords provide extra storage space for your jersey, towels, and other items. Up to 27L large capacity, the bike bag is expandable for more items, perfect for long-distance cycling.