Polyair Xpak #4 Bubble Lined Poly Mailer Xpak4, 9.5" x 14.5" (Pack of 100) Made with an exteriour poly film laminated to a high slip bubble lining The poly film is gray on the inside for inside for privacy protection Peel and seal closure tamper resistant /evident closure Puncture and moisture resistant Low cost shipping protection for a wide variety of products Economical alternatibe to shipping products in a carton UPS, FedEx and USPS friendly