usps usps ground advantage refers to USPS Ground Advantage, a shipping service designed for heavier and larger packages that don’t require expedited delivery. USPS Ground Advantage provides reliable and cost-effective ground transportation, typically used for less time-sensitive deliveries. This service is ideal for packages that need to travel within the U.S. and can take a few days to arrive, depending on the distance and specific service options selected. USPS Ground Advantage is often used by businesses and individuals shipping items that don’t need overnight delivery.