14 lb Tyvek Open End Expansion Mailer Value Pack, First Class, #13 1/2, Flip-Stik, Redi-Strip Closure, 10 x 13, White,100/CT 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. Envelopes made with Tyvek® repel water and resist acids, bases, salts, rot, mildew and stains; perfect for storing taxes and essential papers in the home office. Redi-Strip ® envelopes seal tight to keep contents safe—just pull and press—adheres without moisture for a clean, instant seal. Ideal shipping envelopes for clothing, books, binders and big bulky papers.
