Commercial envelopes, sometimes referred to as an “official” envelope, are widely used for a variety of business and personal correspondence. Commercial envelopes are readily available in many paper varieties and come in 11 common sizes, with or without a window. Also referred to as an open side envelope, the commercial envelopes have a diagonal or double side seam with a commercial style flap.

#6 1/4 Commercial (3 1/2" x 6"), #6 3/4 Commercial (3 5/8" x 6 1/2"), #7 Commercial (3 3/4" x 6 3/4"), 7 3/4 Commercial (3 7/8" x 7 1/2"), #7 3/4 Commercial / Monarch (3 7/8" x 7 1/2"), #8 5/8 Commercial (3 5/8" x 8 5/8"), #9 Commercial (3 7/8" x 8 7/8"), #10 Commercial (4 1/8" x 9 1/2"), #10 Commercial Peel & Seal (4 1/8" x 9 1/2"), #11 Commercial (4 1/2" x 10 3/8"), #12 Commercial (4 3/4" x 11"), #14 Commercial (5" x 11 1/2")