Until recently, the postal service typically offered the most affordable rates for packages weighing less than 10 pounds. But in September, the postal service
lowered its rates for Priority Mail, extending its affordable pricing options to packages weighing as much as 40 pounds.
This move signals the intent of the postal service to compete with FedEx and UPS head-on by targeting the weight classes that they typically deliver the most. Plus, with UPS' and FedEx’s expansion of dimensional weight pricing (charging based on the size of the package, regardless of weight), many businesses that ship large, lightweight packages will probably turn to the U.S. Postal Service as a lower-cost alternative.
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December survey of 700 customers by my company, Endicia, found just that: Eighty percent of the businesses surveyed claimed they will use the U.S. Postal Service for their larger, lightweight shipments now that dimensional weight pricing has come into play.