Heavyweight 18 lb Tyvek Catalog Mailers， Square Flap， Redi-Strip Adhesive Closure， 14.25 x 20， White， 25/Box

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 resistant—virtually 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. Seam Type: Weld; Flap Type: Cheese Blade; Security Tinted: No; Opening: Open End.