Features1PVC waterproof material and high-frequency welding technology are used to achieve sealing and waterproof effect. 2Triangle fixation is stable and reliable. 3The thickened frame supports, which is not easy to collapse even if it is not loaded with bags. It is more beautiful when it is installed on the bicycle. 4The closure of the bag adopts a folding design, which is more effective and waterproof. It not only stylish, but also protects the goods from being wet. 52.3L large capacity to store your items in Cycle. 6The tail lamp(not included) can be installed at the rear of the bag, making it safer to travel at night.SpecificationThis bag is a Cycle storage bag installed on the tube of the bicycle seats. It is easy to install and remove. It is waterproof and hard cover design, practical, safer and convenient for storing and taking items, and will not affect Cycle. Features:PVC waterproof material and high-frequency welding technology are used to achieve sealing and waterproof effect. Triangle fixation is stable and reliable. The thickened frame supports, which is not easy to collapse even if it is not loaded with bags. It is more beautiful when it is installed on the bicycle. The closure of the bag adopts a folding design, which is more effective and waterproof. It not only stylish, but also protects the goods from being wet. 2.3L large capacity to store your items in Cycle. The tail lamp(not included) can be installed at the rear of the bag, making it safer to travel at night. Specifications:Color: black, yellow (optional) Material: PVC Capacity: 2.3L Item size: 326 * 110 * 108mm / 12.8 * 4.3 * 4.3in Item weight: 135g / 4.8ounce Package size: 250 * 150 * 90mm / 9.8 * 5.9 * 3.5in Package weight: 162g / 5.7ounce Packing List:1 * Cycle BagPackage List1 * Cycle Bag