The multi functional urban back roller is an ideal single bag for riders who are looking for a spacious waterproof bike bag to accompany them on their way to work or school made of a special blend of cotton and cordura fabrics the bag has a textile appearance that is a perfect match for both casual and business attirethanks to a polyurethane coating on the inside it is nonetheless absolutely waterproof the practical ql21 mounting system enables you to quickly and conveniently attach the bag