Quality Park, Interoffice Envelopes, String-Tie Box, Brown Kraft, 10x13, 100 per box (63562) REUSABLE: Space for 63 entries so this envelope can be used multiple times DURABLE: This interoffice envelope is made of 28-lb. Brown Kraft paper stock to prevent rips and tears. STRING-TIE CLOSURE: easy acess to contents going through interoffice mailings FEATURES: 100, 10x13 Brown Kraft, Interoffice Envelopes CONVENIENCE: 3 Columns with pre-printed information saves time and is convenient for an interoffice envelope