Quality Park Survivor R1580 Tyvek Mailer, 10 x 13, White (Box of 100) 10 x 13 inches 100 ct. Tyvek Catalog Envelopes Tyvek is strong and moisture resistant. Convenient Flap-Stik closure requires no moisture to seal. Releasestrip makes document easily accessible to recipient, yet maintains security of contents 10 x 13 inches 100 ct. Tyvek Catalog Envelopes