what size is small flat rate box

what size is small flat rate box offered by USPS is 8-5/8 inches x 5-3/8 inches x 1-5/8 inches in dimensions. The Small Flat Rate Box is one of the most affordable shipping options for small and lightweight items, allowing customers to ship goods at a fixed rate regardless of weight (up to 70 lbs) within the United States. The price for this service is based on the box size, and USPS provides a cost-effective solution for sending small items without worrying about the package’s weight or distance. It’s ideal for businesses and individuals looking to send products at a low cost with fast delivery.