These Survivor envelopes expand to provide lightweight, inexpensive shipping for bulky items. Expandable envelopes are made of puncture, tear & 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 & rough handling to deliver your contents intact. With easy to use Quality Park Redi-Strip envelope closures, just peel & press for an instant seal. Lightweight 14 lb Tyvek. Seam Type: Center; Flap Type: Flip-Stik; Trade Size: #13 1/2; Security Tinted: No.