Specifications: Brand: ROCKBROS Weight: about 865g Color: Dark Gray Material: External: 840DTPU Internal: 420DTPU Capacity: Middle: about 10L Both sides: about 2/ 2L Features: Waterproof: The outer shell is made of TPU material and the seams are tightly sealed, so you don't have to worry about rain when riding in the rain. There are waterproof baffles on the sides, which effectively prevent rainwater from entering from the sides, further improving the waterproof performance. Convenient Access: The large opening on the top combined with large zippers on both sides allows you to easily access the items you need during riding. At the same time, the internal mesh pocket design makes classified storage easier. Multiple Straps: Equipped with multiple straps to ensure that the rear rack bag is stable and does not shake during riding. Reflective signage: provides extra safety when driving at night and makes you more easily visible to other road users. Adhesive zipper: The zippers are provided with adhesive tape to make them more durable and waterproof, ensuring long-term use.