Large capacity bicycles back seats bag, spacious to hold carryings for medium and short distance cycling. Features: TPU strong waterproof fabric, seamless hot-melt technology, exquisite details, seamless connection waterproof technology, to ensure the use of full waterproof demand. Easy to wash, anti-scratch and wear-resistant, more suitable for outdoor use. The bag has a portable handle design, which is safer and convenient to use. Built-in interlayer with PE inner lining board, classified storage, make the bag more organized and more convenient to take/place things. The lock catch is made of nylon material, which provides fine flexibility, resistance to load fatigue and durability while maintaining hardness. Reflective pattern design, safer for night riding. Specifications: Color: black, orange, blue, yellow (optional) Capacity: 15-20L Material: nylon+TPU Expand size: 660 * 300mm / 26.0 * 11.8in Package size: 470 * 390 * 60mm / 18.5 * 15.3 * 2.4in Package weight: 1060g / 2.3lb Packing List: 1 * Cycling Bag