How Much Do USPS Flat Rate Boxes Cost? TypeSizePrice Legal Envelopes15" x 9 1/2" $6.05 Small Box8 11/16" x 5 7/16" x 1 3/4" $6.25 Medium Boxes11 1/4" x 8 3/4" x 6" or 14" x 12" x 3 1/2"$12.05 Large Box12 1/4" x 12 1/4" x 6"$16.55
Those are monthly fees right?
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