Features: LARGE CAPACITY: This bag includes a main compartment, 2 side pockets and a back pocket, 13L large capacity, large enough to keep your essentials well organized. The internal patch pocket makes the space effectively used. HIGHER VISIBILITY AND SAFETY: The reflective strip increases nighttime visibility and the hanger on the strip can hold a taillight which can also enhance cycling safety at night. EASY INSTALLATION: Fastener strap for easy and quick installation on all types of bicycles with a rear seat, such as mountain bike, road bike, etc. MULTIPLE FUNCTIONS: With carrying handle and adjustable shoulder strap, the bag can be used as a handbag and shoulder bag as well. GOOD PROTECTION: The elastic band on the top of the bag can help to keep your water bottle, clothes or maps securely on the bag. High quality polyester material construction with solid structure and PE cotton filler, provides your items with full protection. Dual zipper closure, convenient to take out your items. Specifications: Material: Polyester Capacity: 13L (includes all pockets)