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DuPont™ Tyvek® Envelopes are ideal for confidential, sensitive and valuable contents. Once the seal is broken, the word "OPENED" appears in the window, letting the receiver know that the contents have not been compromised. Highly recommended for confidential documents, human resources files, test results, financial statements, evidence/case files, contracts, legal documents and more. Available in various designs and sizes, all featuring self-sealing closures.