Water Resistant: Durable 1680D PVC material is durable and wear-resistant, as well as water resistant, along with an extra rain cover in the bottom pocket, this bike rear seat bag can perfectly protect your items even on rainy days.. Multiple Compartments: There are 4 compartments in total the main pouch, double size zipper pockets, and a rear small pocket; velvet lining and removable thick fleece division boards in the main pouch allow it to keep the camera and other devices safe.. Extensible Volume: The total volume of this bike pannier is 9L, but it can be extended to 25L large volume - Double-side zipper pockets can be opened and extended to 2L capacity, while the second layer zipper on the main pouch can be opened and added extra volume to the bag.. Safe & Secure: Reflective strips on the rain cover and bike bag back make you visible in the dark, while a tail light can be hung on the hole on the bag reflective strip to ensure your safety at night. Multi-functional: With a removable shoulder strap, this bike pannier can be also used as a shoulder bag or a handbag for a camera, photography tools, haircutting kits, makeup tools, etc.