Business envelopes, also known as commercial envelopes, are characteristically open side style with diagonal seams. #7 Business envelopes measure 3-3/4" x 6-3/4" and are come in a range of paper stocks and colors.

While historically the smaller sized envelopes were known as commercials and sizes 7 through 14 were called officials, the Envelope Supplies Shop uses the term business envelopes for all sizes.