ROCKBROS bicycle saddle bag with bottle cage and rear light holder Waterproof (without bot tle) Product details: Brand: ROCKBROS Material: Carbon fibre + 600D Nylon (Black Green) Polyster + PVC (Black) Weight: approx. 215g (Black Green) approx. 228g (Black) Capacity: approx. 1 litre Suitable for most bikes such as mountain bikes, road bikes, ebikes. Fits water bottles with diameter under 6CM Product Details: Rear light holder design: Rear light holder and reflective elements design increase safety when riding at night. Inner pocket design: With the side compartments and mesh pockets, the tools can be placed separately inside. Double zips: This saddle bag uses double zips design, so it is easy to open and close. Note: Please leave a seat tube of more than 20cm so that the bike saddle bag does not rub against the rear wheel.