Regional Rate B boxes are roughly the same size as Large Flat Rate boxes, but cost less to deliver.
Box B1 dimensions are 12 x 10 1/4 x 5, while Large Flat Rate Box 1 is 12 x 12 x 5.5.
Box B2’s dimensions are 14 3/8 x 2 7/8 x 15 7/8, which is wider and flatter than Large Flat Rate Box 1.
The Large Flat Rate Game Board Box is 23 11/16 x 11 3/4 x 3, which is a large rectangular box. Regional Rate B2 is more square.
Regional Rate B’s weight limit is 20 pounds, while Large Flat Rate’s weight limit is 70 pounds.
Regional Rate B costs around $7 to $19 to send a box, while Large Flat Rate costs around $19.
USPS Regional Rate Box Sizes has a link to the USPS store to get boxes.
See Regional Rate Box A.
See Regional Rate Boxes to learn about Regional Rate.