Columbian CO910 12x15-1/2-Inch Clasp 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. Heavy-duty opaque 28lb brown kraft material provides privacy of contents. Open end closure. 12" x 15-1/2" 100 envelopes A durable MULTI-PURPOSE envelope. Dual purpose seal allows for multiple uses. Heavy-duty opaque 28lb brown kraft material provides privacy of contents. Open end closure. 12 x 15-1/2 Inches 100 envelopes Use the moisture activated gummed seal for mailing or the strong metal clasp for repeated use and storage purposes.