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How all envelopes are measured: Regardless of the envelope type or style, state the shortest dimension first and longest dimension second.

1.) Position the the seal flap or the opening at the top of the piece.

2.) Measure the shortest dimension first.

3.) Measure the longest dimension second.

4.) Measure the seal flap length - from the top score to the end of the flap.

OPEN SIDE ENVELOPES HAVE THE SEAL FLAP ON THE LONG DIMENSION Open side envelopes have the seal flap (opening) on the longer dimension and can have diagonal side seams or straight side seams. Open side envelope styles: Announcement, Bankers Flap, Baronial, Booklet, Commercial, Monarch, Official, Square, Remit, Wallet.
No.10 open side /commercial style have diagonal side seams measure height 4 1/8 x width 9 1/2	No.10 open side / booklet style have straight (double) side seams measure 4 1/8 x 9 1/2

OPEN END ENVELOPES HAVE THE SEAL FLAP ON THE SHORT DIMENSION

OPEN END envelopes have seal flaps (opening) on the shorter dimension the most common styles are shown below.

Open end envelope styles: Catalog, Clasp, Coin, Glove, Scarf, Thumb Cut Sleeves, Policy

Style 1 No.10 open end / catalog style have one center seam and bottom seam measure 4 1/8 x 9 1/2	Style 2 No.10 open end / single side seam have one side seam and a bottom seam measure 4 1/8 x 9 1/2	Style 3 No.10 open end / booklet style have double side seams with a full back flap measure 4 1/8 x 9 1/2