Advantage Flap Stik Tyvek Mailer, 9 x 12, White, 100/Box

Durable, lightweight Tyvek mailer is moisture and rip resistant. Tamper Indicating Panel (TIP) flap displays the word OPENED in bold red letters if seal is broken. Flap-Stik self-adhesive closure provides a secure seal. Envelope Size: 9 x 12; Envelope/Mailer Type: Mailer; Closure: Self-Adhesive; Trade Size: #90.

Price: £ 79.98 from Zuma Office Supply US