ACCO Mead OFFICEPAK Clasp Heavy-Weight Brown Kraft Envelopes Bundle - 6x9-inch (25 ct), 9x12-inch (20 ct), and 10x13-inch (15 ct) (Packaging May Vary) Bundle of 3-size clasp envelopes - 6x9 (#76018, 25count), 9x12 (#76020, 20 count), 10x13 (#76022, 15count) Made of heavy-weight brown kraft paper to protect any documents. Tear and puncture resistance. Reusable dual-prong metal clasp closure. Windowless. Also features gummed flaps for secure and permanent seal. Multiple standard sizes for general home, office, school mailing needs, letters, pages, catalogs, legal documents, pamphlet, coupons, etc.