Columbian CO710 12x15-1/2-Inch Clasp Brown Kraft Envelopes, 100 Count A durable MULTI-PURPOSE envelope. Dual purpose seal allows for multiple uses. Use the moisture activated gummed seal for mailing or the strong metal clasp for repeated use and storage purposes. EXTRA heavy-duty opaque 32lb brown kraft material provides privacy of contents. Open end closure. 12" x 15-1/2" 100 envelopes