Quality Park Survivor Tamper Evident Catalog Mailers are made with durable 14 lb DuPont Tyvek , which is strong enough to withstand the most grueling conditions. The material is puncture, tear and moisture resistant virtually indestructible. Yet, it is still lightweight which can provide a savings on shipping costs. Each envelope has a unique tamper indicating panel that displays the word \"OPENED\" in red if the seal is broken. These white mailing envelopes feature an easy Flap-Stik closure which requires no moisture for a secure seal and a release strip for quick, easy opening. When sending critical documents, Survivor Tamper Evident Catalog Mailers are the safe, cost effective way to make sure your items get there intact. Tyvek is a trademark of DuPont used under license by LSC Communications US, LLC d/b/a TOPS Products.

• Catalog mailers made with DuPont Tyvek material are lightweight, yet strong and durable.
• A unique tamper indicating panel on the envelope flap displays the word "OPENED" in red if the seal is broken.
• Made with DuPont Tyvek , these mailers are tough enough to resist punctures, tears and moisture from the shipping process.
• Feature a Flap-Stik peel and seal closure for a clean, sanitary seal without moisture and a release strip for quick opening.