How do I use USPS Soft Pack Envelopes for Cubic Pricing?

Determining cubic tier measurements for Soft Pack Envelopes goes as follows:

  1. Measure the length and width separately in inches
  2. Round down your measurements to the nearest 1/4 inch. For instance, a measurement of 10 1/8 inches is rounded down to 10 inches.
  3. Add the two measurements. In order to qualify for cubic pricing, the total cannot exceed 36 inches.

Assuming your package’s length/width total is 36" or under, the table below determines the Cubic Pricing tier your Soft Pack Envelope package falls under.

Cubic Price TiersLength + Width
0.10Mailpieces measuring greater than 0" and up to (and including) 21"
0.20Mailpieces measuring greater than 21" and up to (and including) 27"
0.30Mailpieces measuring greater than 27" and up to (and including) 31"
0.40Mailpieces measuring greater than 31" and up to (and including) 34"
0.50Mailpieces measuring greater than 34" and up to (and including) 36"
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