Material: PVC Size: 21*9*9.5cm / 8.19"*3.51"*3.71" Color: black, red 1. High-capacity design, easy to store essential riding tools, mobile phones, keys and other small items, freeing your hands and safer. 2. Universal quick-release installation system, suitable for most mountain bike and road bike saddle rails, easy to disassemble and install without tools. 3. Night riding is safer, the tail bag is equipped with high-brightness reflective strips to improve visibility and ensure night driving safety. 4. Waterproof and wear-resistant material, adapt to various weather conditions, and extend service life. 5. Ergonomic fit design, does not interfere with riding movements, lightweight structure reduces the weight burden of the vehicle and improves the riding experience. Package includes:1pcs Bicycle tail bag