Item # TYF1215WH, 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 12" x 15 1/2" Opening End Print Plain Price Quote