large box flat rate shipping usps

large box flat rate shipping usps USPS offers a large box flat rate shipping option through its Priority Mail service. The flat rate pricing allows customers to ship large boxes anywhere within the United States for a fixed cost, regardless of the weight, as long as the contents fit within the box and meet the weight limit of 70 lbs. This option is ideal for businesses and individuals who need to ship heavy items without worrying about fluctuating shipping rates. The large box flat rate service ensures predictability in shipping costs, making it a convenient choice for e-commerce sellers and frequent shippers.