Waterproof material - - - Made of high quality 600D Oxford material, robust, rainproof, durable. The rain cap (included) offers further protection for the things in the bag. 10-25L expandable capacity - - - Folded size: 32 x 17 x 19cm or 12.6 " x 6.7 " x 7.5 ". 2 large side pockets (35 x 28cm), 1 pocket with elastic band for water bottle or gloves, 1 upper mesh bag for a damp raincoat or rain protection cap, 1 zipper to expand the capacity. Reflective strip and taillight - - - There are multiple reflective tapes on the bag to improve the visibility of others when driving at night. And the rear light can be attached to the back of this pannier. Multiple Carrying Ways - - - With a 70-130cm shoulder strap, this bike bag can not only be attached to the rear seat of the bike, it can also be carried in your hand or carried as a shoulder bag. Easy installation - - - There are 2 Velcro fasteners on the bottom of the bag that will help you to secure the bag and protect the carrier bag from falling while cycling. Specification: Color: black, gray Material: polyester Waterproof: Yes Dimensions: 32 17 19 cm (L W H) Volume: 10-25 L (expandable) Net weight: 800g Features: Large expansion capacity Shoulder strap and rain cover are supplied. Structure: 1 x main compartment, 2 x side zip pockets, 1 x back pocket, 1 x upper mesh pocket, 1 x upper elastic band. Multifunctional: bicycle bag, handbag, shoulder bag. Packing list: 1 bicycle pannier bag