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 heav
Expandable fit made of rip and water resistant Tyvek material with self seal flap.
Strong, lightweight envelopes made of Tyvek® material are half the weight of heavy-duty paper envelopes; save on postage with every mailing.