Cubic Pricing, SoftPack

Cubic pricing is a USPS program that allows packages up to certain weight limit to be billed as flat rate boxes by dimension. You can use your own box.

Teapplix provided USPS supports cubic pricing. Simply select "Priority Mail" as shipping method and specify dimensions and weight. Teapplix will automatically provide cubic discount if the resulting price is cheaper than normal weight and zone based pricing.


Softpack is a form of cubic pricing for large Flat Envelopes or Parcels. This is supported by Teapplix USPS. Softpack is a manual select. You must select Priority Mail Softpack shipping method. This method is always present when you have USPS turned on.

  • In Teapplix USPS, if you select Priority Mail Softpack, you still need to enter all three dimensions and can use 1" or 2" as the depth dimension. If the dimension is missing, we will use the weight based shipping rate. If the dimension exceeds 18 x 18 x 2 you will get error. Otherwise you will get softpack pricing. (Please note: softpack pricing may be lower or higher than normal priority mail. It is because the rate is only based on two of the long dimensions. So this is not auto rate shopped with Teapplix USPS.  To add rate shop, you should use Teapplix Rate Shop methods instead)