The Priority Mail Regional Rate Box - B2 (Side Loaded) is a quick, easy, and convenient way for you to ship Priority Mail packages. It is a side-loading box for up to 20 pounds. (Handling fee applied at time of purchase)
Inside Dimensions: 14-3/8" x 2-7/8" x 15-7/8"
Outside Dimensions: 14"-1/2 x 3" x 16-1/4"