A quick, easy, and convenient way for you to ship USPS Priority Mail® packages. The Priority Mail Regional Rate Box™ B1 is a top loading box for up to 20 pounds.
Inside Dimensions: 12" x 10¼" x 5"
Outside Dimensions: 12¼" x 10½" x 5½"
RRB-B1, RRB-B1X, RRB-B1V
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