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Your cart is empty.These Quality Park 10 x 13 interoffice envelopes have a bold personal and confidential message on both sides. Heavyweight 28 lb gray paper stock with large red and blue type protects and clearly flags your sensitive information. Designed with a clever tamper-evident envelope closure. Just seal, then sign your name across the heavily gummed flap. Your recipient will know at a glance if the envelope was tampered with anywhere along your inter office mail route. Large boxes on back record the name of the recipient, their location and department clear as day. Inter department envelopes are a must in any office. These specialty envelopes make confidential documents obvious and recognizable to keep them on their intended course. A simple and affordable upgrade over string & button envelopes for your most important papers. Opaque for privacy and durable enough for any in-house mail system. Use confidential envelopes to send financial reports, contract drafts, performance reviews, human resource mailings and more. 100 Per box.