Envelope Mailability Chart
 Envelope Mailability
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To avoid a surcharge:
- The minimum size must be 3 1/2" x 5".
- The maximum size must be 6 1/8" x 11 1/2".
- The maximum thickness is 1/4".
This template shows the minimum size mailing piece which will
be accepted and the dimensions which are subject to surcharge
for first- or third-class pieces weighing up to one ounce.
The aspect ratio of a mailing piece (the length divided by
the height) should fall between 1.3 to 1 and 2.5 to 1. For example,
a #10 envelope is 4 1/8 x 9 1/2. The aspect ratio is 2.3, so the envelope
is mailable.
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