Lightweight DuPont Tyvek is strong and moisture-resistant, yet light as a cloud in weight. Security of contents is enhanced by an inside printed tint pattern. Convenient Redi-Strip closure requires no moisture to seal and features a removable strip that provides a clean, quick seal upon contact. The peel-off strip protects adhesive from dust for longer shelf life. Treated with an antimicrobial agent to protect the envelope from the growth of bacteria, mold, mildew, fungus and odors.