9 1/2 x 12 1/2" White Flat Tyvek® Envelopes. Tyvek® envelopes provide superior puncture, tear and moisture protection. Constructed from 14 lb. olefin. Ten times stronger than paper envelopes. Feature self-seal closure. Available in plain, First...
9 1/2 x 12 1/2" White Flat Tyvek® Envelopes. Tyvek® envelopes provide superior puncture, tear and moisture protection. Constructed from 14 lb. olefin. Ten times stronger than paper envelopes. Feature self-seal closure. Available in plain, First...