When it comes to shipping packages, you’ll either pay based on the volume of your package or its total weight.
Let’s get the easy one out of the way first. Weight-based pricing is based on the total weight of a parcel. That figure includes the weight of the item(s) inside, the package itself, packing material, and any other elements included in the package. Pretty simple, right?
Volume-based pricing on the other hand, is based on the total area of a parcel in cubic feet. In layman’s terms, it’s based on the outer dimensions of the package. Some USPS mail services such as Priority Mail Cubic are priced based on a package’s outer dimensions. Priority Mail Cubic is the cheapest and fastest way to send small packages up to 20 pounds with USPS, since the price is based on volume only. Priority Mail Cubic is typically only available for commercial shippers. However, there is free USPS shipping software that allows consumers and small businesses to take advantage of those same discounts.