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Tyvek Envelopes
Quick Tip – Tyvek envelope stuff sacks | PMags.com
Survivor® 9 x 12 Catalog Mailer with Self Sealing Closure, Made with DuPont™ Tyvek® Material, 14 lb., Puncture, Tear and Moisture Resistant, 100 per Box
Tyvek Flat Envelope Peel n Seal (open on long dimension) - Sheppard Envelope
Tyvek Envelopes 12" X 15 1/2" Black 100/case Tyc1215b : Target