1. MATERIAL -- It is made of polyester for wear-resistant, tear-resistant and waterproof, besides, durable and easy to clean, protects your items perfectly. 2. DIMENSIONS --the side zippers of the bag are designed for your convenience to store and pick up articles. 3. LARGE CAPACITY -- Totally capacity for holding casual essentials, books, tablet, clothes, or cycling tools and accessories, such as phone, wallet, gloves, glasses, mini pump, tire repair kit, spare tubes and so on. 4. EASY TO USE -- Fastener hook and loop fasteners straps for easy and quick installation on all types of bicycles with a rear seat, such as mountain bike, road bike, etc. 5. APPLICATION--This bag can be used not only when you are riding your bicycle but while walking, shopping or picnicking with your friends. Besides the durable hook and loop fasteners straps that will securely attach it behind the saddle. Product Quantity: 1 Piece Product color: black Product size: 16*40*21cm, This product only includes bike carrier bag