Lightweight 14 lb Tyvek Open End 1.5" Expansion Mailers, #13 1/ 2, Square Flap, Redi-Strip Closure, 10 x 13, White, 25/ Box

• 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.