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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 heavy duty paper envelopes, so you save on postage with each mailing.

• 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 safejust pull and pressadheres without moisture for a clean, instant seal.
• Ideal shipping envelopes for clothing, books, binders and big bulky papers.