Small Flat Rate Box; 8-5/8″ x 5-3/8″ x 1-5/8″ Inside 8-11/16″ x 5-7/16″ x 1-3/4″ Outside $11.00 $11.35 Medium Flat Rate Box; 11″ x 8-1/2″ x 5-1/2″ Inside11-1/4″ x 8-3/4″ x 6 ...

It depends on the size and weight of the flat-rate package and the shipping method used. Generally, flat-rate shipping is cheaper for packages up to 70 pounds that fit within the USPS flat-rate boxes.

Its pricing relies on the weight and size of the package ... may be best sent using the USPS Priority Mail Small Flat Rate Box for $11.00. This box is approximately 8 inches long by 5 inches ...