Features1Expandable design to meet your capacity needs, with a capacity of 25L before expansion and 45L after expansion. 2Detachable composite compartments, which can be freely combined. The main package has 2 thickened partitions that can be combined and placed as needed. 3Big opening for easy retrieval of your items. 4The design of the tail water bottle pocket for easy retrieval the of the water bottle. It is also equipped with tail light hung holes, which can be used in conjunction with bike tail light(not included) for safer night riding. 5The reflective pattern design on the body ensures safer riding at night. 6Up elastic belts design for expand storage space. 7Easy to install and remove, and wear-resistant in use. 8With a handle for convenient carrying.SpecificationThis a accessory for your Cycle activities. This bag is designed to securely attachto your bike's rear rack, providing ample storage space for your essentials. Made from wear-resistant polyester materials for long lifespan. The bag features big opening for easy retrieval of your items. Whether you're commuting, touring, or just going for a casual ride, this bike rear rack bag is a practical and convenient Cycle accessory. Features:Expandable design to meet your capacity needs, with a capacity of 25L before expansion and 45L after expansion. Detachable composite compartments, which can be freely combined. The main package has 2 thickened partitions that can be combined and placed as needed. Big opening for easy retrieval of your items. The design of the tail water bottle pocket for easy retrieval the of the water bottle. It is also equipped with tail light hung holes, which can be used in conjunction with bike tail light(not included) for safer night riding. The reflective pattern design on the body ensures safer riding at night. Up elastic belts design for expand storage space. Easy to install and remove, and wear-resistant in use. With a handle for convenient carrying. Specifications:Color: black Capacity: 25-45L Material: polyester+PVC Item size: 360 * 270 * 260mm / 14.2 * 10.6 * 10.2in Package size: 365 * 280 * 205mm / 14.4 * 11.0 * 8.1in Package weight: 1400g / 3.1lb Packing List:1 * Bike BagPackage List1 * Bike Bag