Is a 6x9 envelope considered a flat?
Is a 6x9 envelope considered a flat? The Postal Service uses the word flats to refer to large envelopes, newsletters, and magazines. The words large envelopes and flats are used interchangeably. Whatever you call them, flats must: Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long OR ¼ inch thick.
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