Our Book Fold Mailers are an economical way of shipping multiple magazines without having to add filler pads. Just fold on desired scores, tape closed and mail! Made from 200-lb-test kraft corrugated cardboard. The ColomPac Bookwrap Mailer is a well-designed self-sealing mailing wrap. The design features include added strength provided by extended corners, multi-scored sides, integrated retention flaps, and a convenient peel-and-seal strip for easy end-user opening.