Aspect
Ratio: length divided by height must
be more than 1.3"
and less than 2.5". Non-machinable letter-size pieces and pieces over 3.3
ounces are subject to flat-size rates.
Flats
Minimum
Maximum
Length
11-1/2 inches
15 inches
Height
6-1/8 inches
12 inches
Thickness
1/4 inch
3/4 inch
Flats
exceeding these dimensions, rigid flats, and flats with
certain characteristics are subject to parcel rates.
Postcards
Minimum
Maximum
Length
5 inches
6 inches
Height
3-1/2 inches
4-1/4 inches
Thickness
.007 inch
.016 inch
Aspect
Ratio: length divided by height must be more than 1.3"
and less than 2.5".
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