Designed and manufactured by Raida, this strap on Raida Cycle saddle bag is an expandable storage accessory with an ergonomic and easy to install design that users find invaluable. It is durable, has an integrated taillight holder that works well, and has sturdy Velcro straps that not only eases installation but also stability on the road. It is also affordable and has a reflective material for safety, particularly when ridding in the dark and early in the morning. They also open widely for easier access and have internal mesh pockets and elastic straps for securing smaller items such as keys , ipods, emergency cash, Energy Bars, Cell Phone, Spare tube, repair kit, multi tools etc. Can Be used for all kinds of Mountain Bikes.