For a low-cost cardboard mailer that keeps your products safe, look no further than our capacity book mailers. These provide excellent protection for all sorts of flat items, such as books, CDs, DVDs, games and more. Their 350gsm shell keeps products safe, while also being slim and compact. This means that not only are they presentable, but they fit within Royal Mail's packaging guidelines. We have a range of sizes, as well as standard & premium options. Browse our range today!