Mail pouch

A mail pouch or mailpouch is a container for mail, designed to transport first-class, registered mail, domestic mail and military mail. It is made of a stronger material (e.g., canvas) than mail sacks (e.g., plastic) and is designed to lock at the top with a mechanism system consisting of special closely spaced eyelets and a strong strap to secure the top where access into the bag is closed off and locked, where a mail sack does not have these features.