usps ground advantage size limits are important to consider when shipping packages through the USPS Ground Advantage service. This service allows for affordable and reliable ground shipping within the United States. There are specific size and weight restrictions that apply. Generally, USPS Ground Advantage can accommodate packages that weigh up to 70 pounds, with a maximum length of 108 inches (combined length and girth). For oversized or unusually shaped packages, other services like Priority Mail or UPS may be more suitable.