![]() How much does it cost to mail an ep14 envelope? This is why tyvek envelopes are ideal for legal and medical offices. ![]() Because the fibers are so closely spun, these envelopes are waterproof and moisture-resistant. Tyvek Envelopes Are Waterproof Tyvek was developed by DuPont in the 1960s, and essentially, it’s a fast-spun, dense blend of polyethylene plastic. Tyvek envelopes are tough, lightweight envelopes made with tear and moisture resistant material, offering security and protection for your most sensitive communications. They are great for keeping valuable documents. It is light, strong, waterproof and durable. *DuPont™, the DuPont Oval Logo and Tyvek® are trademarks or registered trademarks of DuPont or its affiliates. Priority Mail® Tyvek Envelope This durable, water resistant Priority Mail® Tyvek®* envelope offers you flexibility when shipping a variety of items. Priority Mail Tyvek Envelope 15 1/8″ x 11 5/8″ – Supplies Store. Enter both the weight and dimensions for these shipments. If you use a Tyvek Envelope when shipping via USPS Priority Mail, be sure to select the Soft Pack Cubic package type on the READY TO SHIP page in ShippingEasy for the best rate.
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