H-Bear Camping Backpack 12.92L Cycling Rack Pack Bag Bike Rear Seat Bag 840-D polyester material is durable and not easily penetrated by oils and other liquids Using high quality hardware accessories, able to withstand powerful pull torsion U-shaped zipper design allow you to store and take the things easily Webbing quick release system easy to be removal and Suitable for a variety of models Reflective yellow tape design, night riding will be safer