The cheapest service to deliver packages that are relatively heavy yet small in size is USPS Cubic Pricing via Priority Mail®, which calculates shipping rate based on the package’s dimensions instead of weight. Thus, it’s the perfect solution for eCommerce stores selling small auto parts, toys, tools, etc., saving up to 89% off compared to other shipping services.
To qualify for Cubic pricing, packages must weigh less than 20 lbs, measure no more than 0.5 ft3 (12 x 12 x 16 inches) and the longest dimension measures no more than 18 inches. The shape of the package can not be rolls or tubes, and there are two different methods to determine the Cubic tier. This is where it gets complicated.
Formula: Length x Width x Height / 1728 = Cubic Feet
Although you may not ship tubes or rolls (such as carpets, posters) with Priority Mail Cubic, you can, however, ship padded envelopes and poly softpacks. There’s a different method to calculate the Cubic tier.
Please Note: Poly mailer will be measured as if it's a box. The excess part of the envelope will be calculated.
With all that said, you’re probably now wondering where to get this amazing service. Cubic via Priority Mail is available through USPS accounts with CPP rates (Commercial Plus Pricing). You can get deeply discounted shipping labels with these accounts if you ship at a very high volume. And if you don’t? Then check out ShipSaving, a shipping software designed to help e-commerce businesses, especially small and medium-sized businesses (SMBs) to get started and scale. Register an account now and see the USPS discounts for yourself. Plus, there’s a USPS rebate program, where you can get cash back while you ship.