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Dive Brief:

The U.S. Postal Service is planning to eliminate ounce-based rate differences for shipments within its USPS Ground Advantage Commercial service starting on July 12, the agency announced Monday, a move that could sting some lightweight package shippers.

Currently, published prices on sub-pound Ground Advantage Commercial parcels vary, with four distinct weight tiers featuring different rates. The proposed change, which is pending review from the Postal Regulatory Commission, would apply rates currently for shipments weighing between 12 and 15.999 ounces to all sub-pound parcels within the category.