1.Nylon waterproof fabric.The surface layer is made of nylon waterproof fabric, lightweight and wear-resistant. The middle layer is a diamond mesh structure with polyester yarns overlapping each other, to enhance the overall tear resistance of the fabric. And the bottom layer is polyester fiber fabric, which is waterproof and wear-resistant. 2.The dry bag uses 210D hot pressed waterproof fabric. And hard shell harness frame are designed as a split system. No screws are required to install them. They can be quickly installed on the bicycle through velcro and webbing. They are fixed at 4 points and are very stable. 3.No screws are required to install them. They can be quickly installed on the bicycle through velcro and webbing. They are fixed at 4 points and are very stable. 4.The dry bag is equipped with vent holes to facilitate air discharge and accommodate more items. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store