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Cubic Pricing, SoftPack
Cubic pricing is a USPS program that allows packages up to a certain weight limit to be billed as flatrate boxes by dimension. You can use your own box. To determine if your box qualifies, use the following calculation:
 All three dimensions (length, width, and height) of your box are not greater than 18 inch .
 Measure the length, width, and height of your box in inches. Round down to the nearest 1/4 (or 0.25) inch.
 Multiply the length by the width by the height and then divide that number b 1,728.
If the value comes out to less than 0.50, your package qualifies for one of the five cubic tier rates. If your value is in between two of the rate tiers, it belongs to the higher rate tier.
For example, if you have a package that measures 11in. in length, 9in. in width, and 5.75in. in height, the cubic ft. value would come out to 569.25/1,728 = 0.329. This is over 0.30 so the package qualifies for the cubic rate tier 0.40.
Teapplix provides USPS support for cubic pricing. Simply select "Ground Advantage" or "Priority Mail" as the shipping method and specify dimensions and weight. Teapplix will automatically provide the cubic discount if the resulting price is cheaper than normal weight and zonebased pricing.
Softpack
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 the Ground Advantage Softpack or 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 inch or 2 inch as the depth dimension. If the depth entered is more than 2 inch, we will automatically use 2 inch.
 If the dimension is missing or one of the dimension exceeds 18 inch, we will use the weightbased shipping rate. (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)
 How to calculate the Ground Advantage Softpack cubic size:
 if length + width <= 16 inch, cubic size is calculated as 0.1
 if length + width is between 17  21 inch, cubic size is calculated as 0.2
 if length + width is between 22  24 inch, cubic size is calculated as 0.3
 if length + width is between 25  26 inch, cubic size is calculated as 0.4
 if length + width is between 27  28 inch, cubic size is calculated as 0.5
 if length + width is between 29  30 inch, cubic size is calculated as 0.6
 if length + width is between 31  32 inch, cubic size is calculated as 0.7
 if length + width is between 33  34 inch, cubic size is calculated as 0.8
 if length + width = 35 inch, cubic size is calculated as 0.9
 if length + width = 36 inch, cubic size is calculated as 1
 How to calculate the Priority Mail Softpack cubic size:
 if length + width <= 21 inch, cubic size is calculated as 0.1
 if length + width is between 22  27 inch, cubic size is calculated as 0.2
 if length + width is between 28  31 inch, cubic size is calculated as 0.3
 if length + width is between 32  34 inch, cubic size is calculated as 0.4
 if length + width is between 35  36 inch, cubic size is calculated as 0.5