Features 1、The main bag has a capacity of about 12L. It is equipped with a removable compartment and shock-proof protective cotton, which can accommodate a SLR camera set. 2、Two zippers expansion space on the top can place personal belongings. 3、The hidden shoulder strap in the independent compartment allow you to freely switch this bag between a backpack and a shoulder bag. 4、The front pocket uses a reflective zipper, plus reflective strips on both sides and the tail of the bag, making night riding safer. 5、The bike rear rack bag adopts a three-point fixation method, with two strong hook and loop straps on the bottom and a webbing buckle on the front. Driving on bumpy roads remains stable and reliable. Features: The main bag has a capacity of about 12L. It is equipped with a removable compartment and shock-proof protective cotton, which can accommodate a SLR camera set. Two zippers expansion space on the top can place personal belongings. The hidden shoulder strap in the independent compartment allow you to freely switch this bag between a backpack and a shoulder bag. The front pocket uses a reflective zipper, plus reflective strips on both sides and the tail of the bag, making night riding safer. The bike rear rack bag adopts a three-point fixation method, with two strong hook and loop straps on the bottom and a webbing buckle on the front. Driving on bumpy roads remains stable and reliable. Specifications: Material: Polyester, PU Capacity: About 12L Size: 37*17*19cm/ 14.6*6.7*7.5in Weight: 530g/ 18.7oz Package list: 1 * bike rear rack bag Package List 1 * bike rear rack bag