Both side carrier bg (possible to fix on left or right carrier side), with strong and easy carrier fixation. Waterproof fabric, on bottom part is used protection from rubbered fabric. There is one main pocket, reflective straps. Also possible to combine with top carrier bag A-N421 and A-N472. Suitable to use rain cover A-021. Recomended to use with sear post carier ACR-149, also available for other carriers ACR-20N or ACR-25.