Quality Park - QUA43768 10" x 13" Postage Saving ClearClasp Envelopes feature a reusable, Redi-Tac closure for repeated use when storing or routing. Innovative technology eliminates the upcharge to mail an envelope with a metal clasp. Fully gummed flap provides a permanent, secure seal. 28 lb. brown Kraft stock is sturdy enough to protect contents while in transit or storage. Multifunctional envelopes are a must-have in any office.