Business envelopes, also known as commercial envelopes, are characteristically open side style with diagonal seams. White #7-1/2 Business envelopes measure 3-15/16" x 7-1/2" and are made from 24# stock. White #7-1/2 business envelopes are standard for mailing and come in a range of paper stocks and security features.

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.