HEAVY-DUTY MAILING TUBES More than just a mailing tube. It's the way your product/goods travels. From the beginning to the end, these heavy-duty kraft mailing tubes help keep your rolled materials safe during shipment. Our durable and dependable mailing tubes are one of the strongest in the industry. They are ideal for sending posters, art, hard items, etc. These high-quality tubes are spirally wound and manufactured so they will not bend or damage products.