Survivor Tyvek Tamper-Indicator Envelopes, 9in x 12in, Self-Adhesive, White, Box Of 100

When the envelope is unsealed, the word "OPENED" appears on the flap Brings an extra level of security to your important, confidential documents. Envelopes cannot be repaired to hide any evidence of tampering. Made of 14-lb Tyvek material.