Postage Saving ClearClasp envelopes, with reusable Redi-Tac closure for repeated use when using for storage or routing. This innovative technology eliminates the USPS upcharge to mail a metal clasp. Fully gummed flap provides a secure permanent seal when mailing. 28 lb. brown Kraft stock is sturdy to protect contents while in transit or storage. This multi-functional envelope is a must-have for any office. Purchasing will be at a minimum with the convenient 100 per box count. Let Quality Park be your partner for all your envelope needs!