Survivor QUAR4200 Tyvek 10 x 13 18 lb. Heavyweight Square Flap Open End Expansion Mailers - White (100/Carton)

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-Stripenvelopes seal tight to keep contents safejust pull and pressadheres without moisture for a clean, instant seal Ideal shipping envelopes for clothing, books, binders and big bulky papers