This envelope is our most popular #9 business envelope! This popular line of white wove 3-7/8" x 8-7/8" commercial envelopes is manufactured with diagonal seams, no window, flap down, and a traditional remoistening seal. #9 regular envelopes are one of the most popular commercial-sized envelopes available, commonly used as a reply envelope for invoice and business mailings. This 24lb. white envelope is a quality and economical choice. These #9 size envelopes are also machine-insertable for higher-volume direct mail. Packaged in boxes of 500. 6.5 lbs. per Box