10" x 13" interoffice envelopes feature a string-and-button closure to conveniently route documents. These envelopes are a must in any office. They keep documents contained and organized while routing throughout the office. 28 lb. brown Kraft stock is durable for prolonged use. String-and-button closure holds up over time and makes accessibility easy. Envelopes are formatted with five columns on each side with narrow ruling to fit signatures. Envelopes are hole-punched on both sides to provide a preview of contents without opening.10" x 13" interoffice envelopes feature a string-and-button closure to conveniently route documents. These envelopes are a must in any office. They keep documents contained and organized while routing throughout the office. 28 lb. brown Kraft stock is durable for prolonged use. String-and-button closure holds up over time and makes accessibility easy. Envelopes are formatted with five columns on each side with narrow ruling to fit signatures. Envelopes are hole-punched on both sides to provide a preview of contents without opening.