Columbian Brown Kraft Clasp & Gummed 10 x 13 Inch Columbian Clasp Envelopes 100 Count (CO997) 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. 10" x 13" 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. 10 x 13 Inches. 100 envelopes Use the moisture activated gummed seal for mailing or the strong metal clasp for repeated use and storage purposes.