ROCKBROS is an original brand founded by cycling enthusiasts. The goal of ROCKBROS is to offer high - quality products at an affordable price to every customer who loves cycling and outdoor sports. ROCKBROS Bicycle Rear Luggage Carrier Bag Specifications Brand: ROCKBROS Model: A6 Material: EVA + 210D Nylon Color: Black Dimensions: Capacity before expansion: 10L Capacity after expansion: 35L Expandable Design and Large Capacity The bag can be expanded, allowing you to carry more items while cycling. Capacity before expansion is 10L, and after expansion, it reaches 35L. With Rain Cover A rain cover is included in the package, which can protect the bag from rain. With 3M Reflective Stripes The reflective stripes ensure safety during night cycling.