The back roller city is a paired back no frills waterproof pannier set for riders who just need to quickly and easily move their kit around the tried and tested pvc coated polyester material has proven reliability and the capacity is very generous for the moneythe ql1 mounting system is quick and simple to use for no fuss operation and fits rear racks with rails up to 16mm in diameter the bags can be used individually or as a pair giving you plenty of flexibility of use large 3m reflector