Square envelopes are considered non-machinable so add the extra $0.21. Square envelopes must be a minimum of 5". Check out the full list of non-machinable characteristics. Otherwise, you may have a "non-machinable" envelope and add $0.40 of extra postage. Make sure your envelope is of uniform thickness, rectangular, and bendable. Your envelope must be a minimum 5” x 3.5”, maximum 11.5” x 6+⅛”, and no thicker than 1/4".
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