usps use own box

usps use own box USPS use own box is an option available for shipping with services like Priority Mail, Ground Advantage, and First-Class Package. While USPS offers Flat Rate packaging, customers can also use their own boxes if they meet size and labeling standards. Rates are then determined by weight and distance. Using your own box allows greater flexibility in packaging irregular or branded items. Businesses often prefer this option to preserve brand identity or optimize dimensional weight savings while still accessing USPS delivery infrastructure.