525 x 600 mm plastic mailing bags. Royal Mail Letter size. Pack of 200. Our polythene grey mailing bags are great value economy mailers that do not compromise on quality. Suitable for a multitude of mail order products. The versatile nature of our mailing bags makes them popular across a wide range of industries including mailing, catalogue and internet companies. They are ideal for sending your items through the post or via a courier. Each mailing bag has a polythene lip with an easy to use pee