Material: It is made of high quality waterproof nylon fabric, fine workmanship, increases surface tear resistance, not easy to scratch, good water wrinkle resistance, dry inside and outside, durable, long service life.Capacity: The large compartment can accommodate a water bottle as well as a small mesh pocket and a two-way zipper on the outer layer.Multifunctional: The trapezoidal design of the back reduces the space required for the bike bag and increases its capacity.There are two buckles on the front and back of the bike back bag and one buckle on the left and right sides for stable attachment.Quick Installation: The bike saddle bag rack is quick and easy to install on your bike, no tools required, fits most bikes with back seat.With a wide gray double reflective band, you can ride safely at night.Lightweight bike rack bag, lightweight design with pull-up, wrinkle-resistant material.