QUAR2420, Quality Park Tyvek Tamper Indicating Envelopes QUA R2420

Quality Park TYVEK & Tear-Resistant Envelopes: Quality Park R2420 Tyvek Tamper-Indicating Envelopes, Plain, 10'' x 13'', 100/BX, White, QUAR2420, Envelopes feature flap with patented tamper indicating panel. Once flap is raised, the words "OPENED" appear in red and cannot be repaired to hide evidence of tampering. Envelopes of DuPont Tyvek won't rip, tear or puncture. Much stronger and more secure than traditional paper envelopes. Water-resistant and moisture-resistant. Lightweight to save on postage costs. Easy to use. Peel and seal. UPC 85227124203