Business envelopes, also known as commercial envelopes, are characteristically open side style with diagonal seams. #16 Business envelopes measure 6" x 12", are made with 28# tan / brown kraft stock and feature a deep flap with long overlap and wide and heavy gum seal.

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.