FULLY WATERPROOF: This bike pannier bag made with High density 840D Nylon and covered with TPU film which ensure you can use this bag freely on rainy day or wet weather without worrying about your items getting wet inside the bag or scratched. The bag's surface is easy to clean and can be wiped clean with a wet cloth in seconds without fear of muddy roads. Max 27L LARGE CAPACITY: Exterior bungee cords (rain jacket,umbrella) + Interior main compartment together with mesh pockets. 27L capacity each bag can holds your change of clothes or some essentials for the cycling trip. The mesh pockets inside the bag can store some small items for easy access. Suitable for multiple occasions like outdoor long distance rides, daily commute or transport groceries. THREE-POINT ATTACHMENT SYSTEM: Two movable buckles on the back of the bag help you adjust the bag to the right position according to your bike rack.The 360-degree rotatable bracket is used to secure the bag to the side bars to prevent the bag from bouncing out. It can be easily adjusted without additional tools which become a real quick release system. HUMANIZED DESIGN: The fixing plate on the back of the bag effectively prevents the pannier bag from getting into the bike spokes. Roll up closure design be of more waterproof performance than traditional zippers,and it can help you easily access the personal belongings in the bag. MORE DETAILS: Reflective logo on both side of bag ensures your night time riding safety. Two round pads at the bottom to reduce friction and protect the panniers.And the bicycle panniers also comes with a comfortable rubber and nylon carrying handle for your convenience.