flat rate shipping usps box sizes

flat rate shipping usps box sizes come in several standard dimensions for ease of use when shipping with USPS. The flat-rate boxes are available in multiple sizes, including small, medium, and large options, each with its own pricing. These boxes allow customers to ship items at a fixed price, regardless of the weight (up to a specified limit), which can be very cost-effective for shipping heavier items. USPS also offers regional flat-rate boxes, which may be more economical depending on the shipping distance.