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Leave the heavy boxes and clunky cartons behind by opting for Expansion Envelopes when mailing items too thick to fit in a standard envelope, like books, financial reports, and gifts! Expansion Envelopes have an accordion folded side panel designed to expand anywhere from 1 inch to 4 inches to accommodate your materials, yet they stack flat so they don't take up much storage space in your office. Choose from durable white or brown kraft paper or lightweight and tear-resistant Tyvek® material. All expansion envelopes have a Zip Stick® self-adhesive flap on the short side to help you close the envelope securely.

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