This bag is a cycling storage bag installed on the tube of the bicycle seats. It is easy to install and remove. It is dailylife waterproof and light weight design, practical, safer and convenient for storing and taking items, and will not affect cycling. Features: The frame of the tail bag is made of reflective material, and the surface of the bag body is also coated with colored reflective coating, which is safer for night cycling. Light weight and compact size, no increase in cycling burden. The surface of the tail bag is made of cationicGrid material and comes with a waterproof zipper, making it suitable for daily use in light rain. 1.8L large capacity ample for your cycling needs. The tail lamp(not included) can be installed at the rear of the bag, making it safer to ride at night. The bag shape is stiff and smooth, with thickened three-dimensional support to protects internal itmes and prevents them from being squeezed. Built in mesh pockets for organized storage. Equipped with dual zipper, waterproof and smooth in use. Specifications: Color: black Material: cotton+cloth Capacity: 1.8L Item size: 230 * 100 * 90mm / 9.0 * 3.9 * 3.5in Item weight: 110g / 3.9ounce Package size: 230 * 105 * 90mm / 9.0 * 4.1 * 3.5in Package weight: 127g / 4.5ounce Packing List: 1 * Cycling Bag