usps advantage ground is another term referring to USPS Ground Advantage, a service introduced to consolidate previous USPS ground offerings. It delivers packages under 70 pounds in 2–5 business days across the contiguous United States. Ground Advantage includes tracking and automatic insurance coverage for most shipments. It’s ideal for e-commerce sellers seeking a cheaper option than Priority Mail, while still providing delivery confirmation and the ability to ship to P.O. boxes and military addresses.