Self-Seal Tear-Proof Polyethylene Mailers Durable mailer for multiple applications. These 12x15.5 inch polyethylene mailers are just the right size for many of your shipping needs. The exterior of each mailer is water, tear, and puncture resistant, preventing damage to the items inside while the package travels to its destination. Lightweight, saves on postage High-strength seams allow over-stuffing Ink, stamps and labels adhere easily Water, tear, and puncture resistant The bubble mailers are approved to use with all major carriers.