?1. MATERIAL? Rear bike bag made of high density waterproof nylon fabric, Stylish and classic design, it can cope with most road conditions, it has high abrasion resistance, tear resistance high and durability.Moreover, the inside of the bag has rubber coating, which can protect your property well. ?2. LARGE CAPACITY? 15 liters on one side, around 30L on both sides, easy to carry all your essentials on the go, Independent departments and large pocket. Two side packs allow you to put as many items as possible, which gives you enough space. There are 1 mesh pockets on the outermost layer on both sides for easy access. ?3. QUICK INSTALLATION AND RELEASE? The saddle bag comes with adjustable snap to secure the bike luggage bag. no need to install any tools, fit all bikes with rear seat, complete the installation quickly, can be removed at any time for easy transportation. Large double gray reflective stripe, ensures safe driving at night. ?4. LIGHTWEIGHT? Double bicycle bag trapezoidal design reduces bulk and increases the capacity of the bicycle bag. Easy-to-clean rear mudguard prevents the bag from getting dirty with mud or the bag from entering the vehicle wheel at the same time. ?5. MULTI-PURPOSE? This double bicycle luggage bag is perfect for short and long trips and excursions; The bike rack pack will also be a good bike gift for your child to go to school, backpack farewell and not leave the weight submerge your child's shoulder.