Opening: 14" (350mm) Length: 19" (482mm) Self seal lip = 50mm Thickness = 60mu (micron) Grey mailing bags are the perfect piece of packaging to make up your basic packaging supplies, lightweight and durable with a self seal lip they can be used to send thousands of different things. More durable than a simple paper envelope our mailing bags are versatile but if grey isn't the right colour for you then take a look at the rest of our range for more colours and sizes.