Super-strong mailers are made from multiple layers of coextruded film and have supreme puncture-, moisture-, and tear-resistance. Perforated, pre-opened bags on a roll are convenient for large mailings and saves on packing time. Postal compliant bags have non-gloss finish to make scanning easier. 1/8" vent hole in bags helps to remove excess air and makes packaging easier. Film is specially treated for thermo printing.