The standard office envelope that 99% of people use is what is called a #10 Envelope. This staple of the office copy room is merely the tip of the ice berg of the shapes and sizes that envelopes come in. There are 13 different size commercial envelopes alone, plus all the sizes of announcement, square, catalog, and booklet envelopes! … Envelopes: Sizes, Tips, Things You Never Knew…
