15 x 20 4 Coextruded Gusseted Poly Mailers 2.5 mil 100 Mailers MLS25989
Super-strong envelopes will not tear or burst, already when overstuffed. Tough, multi-layer materials shouldn’t be solely lighter and stronger than paper, but in addition water resistant. Self-seal lip types a decent closure to maintain contents secure. Light weight reduces postage prices.