Features： 1、Wear-resistant and sturdy Oxford cloth material ensures long-lasting use. 2、Water-resistant surface keeps your belongings safer and drying. 3、Large capacity with expandable design allows you to carry more items. 4、Can be used as a backpack with widened and thickened belts for comfortable carrying and reduced pressure on your back. 5、Triangular fixation system keeps the bag stable and prevents it from shaking. 6、Multiple reflective strips ensure safety during night rides. 7、Convenient front and back pockets for easy take out of your belongings. Specification： This is a sturdy and wear-resistant bag made from fine quality Oxford cloth material. With its water-resistant surface, this bag is for any weather condition. Its large capacity and expandable design make it for carrying all your essentials on your bike rides. Plus, it can also be used as a backpack for added convenience. Features: Wear-resistant and sturdy Oxford cloth material ensures long-lasting use. Water-resistant surface keeps your belongings safer and drying. Large capacity with expandable design allows you to carry more items. Can be used as a backpack with widened and thickened belts for comfortable carrying and reduced pressure on your back. Triangular fixation system keeps the bag stable and prevents it from shaking. Multiple reflective strips ensure safety during night rides. Convenient front and back pockets for easy take out of your belongings. Specifications: Color: black, dark grey (optional) Capacity: 17-29L Expand size: 600 * 290 * 170mm / 23.6 * 11.4 * 6.7in Fold size: 350 * 290 * 170mm / 13.8 * 11.4 * 6.7in Package size: 440 * 360 * 60mm / 17.3 * 14.2 * 2.4in Package weight: 1026g / 2.3lb Packing List: 1 * Cycle Bag Package List： 1 * Cycle Bag