Both side carrier bag (possible to fix on left or right carrier side), with strong and easy carrier fixation. Watterproof fabric, on bottom part is used protection from rubbered fabric. There is one main pocket (volume 13l) reflective straps. Also possible to combine with top carrier bag A-N421, suitable to use rain cover A-O21. Recomended to use with seat post carier ACR-149, also available for other carriers ACR-10 / 20 / 25.