Item # TYF1013WH, Flat Tyvek Envelopes Request Information 🖨 Printable Page ⬇ Download PDF ✉ Email This Page ⤢ CLOSE WINDOW Flat Tyvek® EnvelopesTyvek envelopes provide superior puncture, tear and moisture protection.Constructed from 14 lb. olefin.Ten times stronger than paper envelopes.Feature self-seal closure.100 per case. Specifications W x L 10" x 13" Opening End Print Plain Price Quote