Specification Brand: ROCKBROS Material: Polyester + PU Color: Black Capacity: approx. 5 - 9 L Weight: approx. 450 g Features Large Capacity: This rear bicycle carrier bag measures 37 * 17 * 16 cm / 14.6 * 6.7 * 6.3" (L x B x H) and has a capacity of approximately 9 liters, which is sufficient to store e - bike batteries, bicycle tools, bike tire pumps, cable locks, clothing, wallets, power banks, and daily necessities. Practical: The ROCKBROS bicycle pannier bag has two compartments that can be removed or inserted, keeping all stored items well - organized. Multiple pockets on the outside and inside help to safely collect small but important items, making it perfect for daily use or traveling. Waterproof & Reflective: Our rear bike seat bag is made of highly rated tear - resistant and abrasion - resistant polyester and PU material, which is water - repellent and easy to clean. It comes with a green rain cover that can effectively resist water and rain. Reflective strips around the bicycle luggage bag create a good warning effect at night. Multifunctional: It is not only a bicycle bag but also a cross - body bag. With a detachable shoulder strap, you can take it anywhere. The detachable shoulder strap is adjustable from 25.2/64 cm to 48.6"/124 cm. Additionally, it is provided with a handle to be used as a handbag. Easy and Quick Installation: The bicycle carrier bag is equipped with 4 adjustable Velcro fasteners that are easy to install and remove in seconds. It is suitable for most bicycle carriers such as mountain bikes, road bikes, e - bikes, and commuter bikes.