1. capacity: The bicycle bag has large space up to 50L, so you can carry many things with you easily. The surface of the bag is made of 600D nylon and the interior is made of 300D nylon fabric, which makes it better durability and stronger load capacity. 2. Powerful attachment: This bike bag is designed with strong Velcro and buckle to attach to your bike tightly. The bag comes with a zipper and a large compartment with strong Velcro and buckle to protect your belongings from loss. 3. Night reflective reminder: It has reflective trims and set on the back of the bike bags, and the surface of the bag is made of 600D nylon, which is strong and solid. This makes you more eyecatching at night and r when driving at night. 4. density tarpaulin: A density waterproof cloth will be sent with the bags as a gift. The material is made of density tarp and the process is stricter, which makes it much better than the traditional 600D material. So you could have better protection for your companion items in the bags while it rains.