Heavyweight 18lb Tyvek Open End Expansion Mailers， #15 1/2， Cheese Blade Flap， Redi-Strip Closure， 12 x 16， White， 100/Carton

These Survivor® envelopes expand to provide lightweight， inexpensive shipping for bulky items. Expandable envelopes are made of puncture， tear and moisture-resistant DuPont™ Tyvek® material. Envelopes made with Tyvek® are half the weight of heavy duty paper envelopes， so you save on postage with each mailing. Our tough expandable mailers resist overstuffing， bad weather and rough handling to deliver your contents intact. With easy to use Quality Park® Redi-Strip® envelope closures， just peel and press for an instant seal. Seam Type: Center; Flap Type: Cheese Blade; Trade Size: #15 1/2; Security Tinted: No.