Tyvek Jumbo Mailer, 15 x 20, White, 25-box

Sturdy, jumbo envelopes offer a super-strong Tyvek construction and a convenient Flap-Stik closure. Theyre great for storing artwork, plates, negatives, maps and blueprints. Heavyweight envelopes wont rip, tear or puncture. Much stronger and more secure than paper envelopes. Moisture resistant. Protects against foul weather.