Survivor Heavyweight 18 lb Tyvek Catalog Mailers, Square Flap, Redi-Strip Adhesive Closure, 18 x 23, White, 25/Box (R5121)

Quality Park Survivor 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 resistantvirtually indestructible. Yet, it is still lightweight which can provide a savings on shipping costs. 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. Heavyweight 18 lb Tyvek. Seam Type: Weld; Flap Type: Square; Security Tinted: No; Opening: Open End.