Rifkin Security Division has made available a high-security mail transport sac. Approved for use through the U.S. Postal Service, each MailSafe bag offers keyless, tamper-evident protection from unauthorized access. The reusable mail sac is constructed of heavy-duty Arco 600 fabric and easily holds 3.5 pounds of material. Significant postage and envelope savings can be realized over the life of the bag when compared to similar sized paper products. Users simply place desired items inside the bag, close the zipper-seal chamber and insert a uniquely numbered seal. If the recipient notices a broken or different numbered seal, the contents of the bag have been compromised.