Description: Use the same material as outdoor waterproof dive bags - 500D double-sided PVC waterproof material, stronger and more waterproof than ordinary 600D polyester or Oxford cloth bags. Features锛?/strong> 1. Applicable for any rear rack diameter of between聽8-16mm. 2. Waterproof Material: Made of thick PVC net clamping cloth to ensure it is airtight, watertight, and durable.3. Large Capacity: The main body of the bike bag has a large capacity of 25L. Suitable for multiple occasions such as long-distance outdoor rides, daily commutes, or transporting groceries.4. Comes with a detachable shoulder strap聽and聽double buckle on the back. The backpack also can be fixed on the rear rack while cycling.