The brompton roll top bag the waxed cotton roll top bag from brompton is a new versatile and compact roll top bag not only works as a clever bike bag but also as a stylish about town bag for everyday use the roll top closure allows you to adjust the capacity of the bag depending on your needs whether yoursquore carrying only the essentials or heading back from the shops the front adjustable strap keeps things neat and secure while you ride as well as this the bag features a quick adjust