Waterproof Material —– Made of high quality 600D oxford material, sturdy, rainproof, durable. The rain cap (included) provides further protection for the things in the bag. 10 - 25L Expandable Capacity —– Folded Size: 32 17 19cm / 12.6" 6.7" 7.5". 2 large side pockets (35*28cm), 1 pocket with elastic band for water bottle or gloves, 1 upper mesh bag for wet raincoat or rain cap, 1 zipper to expand capacity. Reflective strip and taillight —– There are several reflective bands on the bag to improve the visibility of others when driving at night. And taillight can be attached to the back of this bike bag. Multiple ways to carry —– With a 70-130cm shoulder strap, this bike bag can not only be attached to the bike back seat, but can also be taken in your hand or carried as a shoulder bag. Easy installation —– There are 2 Velcro fasteners at the bottom of the bag that will help you attach the bag and protect the carrier bag from falling off while cycling. Specification:● Color: black, grey ● Material: polyester ● Waterproof: Yes ● Dimension: 32 × 17 × 19cm (L × W × H)● Volume: 10-25L (expandable) ● Net weight: 800g Features: ● Large expansion capacity ● Shoulder strap and rain cover are supplied. ● Structure: 1 x main compartment, 2 x side zipped pockets, 1 x back pocket, 1 x upper mesh pocket, 1 x upper elastic band. ● Multifunctional: bike bag, handbag, shoulder bag. Packing List: 1 × Bike Rack Bag