9L LARGE CAPACITY - Dimension of 13.2 x 7.9 x 8.65(L x W x H), max 9L storage capacity with 2 inner mesh pocket. This bike rack bag has enough capacity to store all your cycling essentials like bike tire pumps, cable lock, jacket, etc. The elastic drawstring on the rack bag can also help tie a lot of items you need. HIGH QUALITY & FULLY WATERPROOF - This bike rack bag adopts reinforced hard shell polyester coated with PU, featured as water resistant, durable, lightweight and easy to clean. Waterproof materials & water resistant double zipper can help keep your equipment dry. This bag also comes with a rain cover, so don t be afraid to cycling in rainy day.