Why is USPS Priority Mail Cubic so Cheap?
It’s a cost-effective option since the USPS determines the shipping price based on the size of the package and distance traveled, instead of the package’s weight.
In comparison, most other popular USPS service levels calculate cost based on a package’s weight—making USPS Cubic pricing an appealing alternative for shippers.
To see if your package qualifies for USPS Cubic pricing, you’ll need a calculator and measuring tape.