Priority Mail Regional Rate Boxes*
Product Inside Dimensions Outside Dimensions
Box A*
top loading
10" x 7" x 4-3/4" 10-1/8" x 7-1/8" x 5"
Box A*
side loading
12-13/16" x 10-15/16" x 2-3/8" 13-1/16" x 11-1/16" x 2-1/2"
Box B*
top loading
12" x 10-1/4" x 5" 12-1/4" x 10-1/2" x 5-1/2"
Box B*
side loading
15-7/8" x 14-3/8" x 2-7/8" 16-1/4" x 14-1/2" x 3"
Box C* 14-3/4" x 11-3/4" x 11-1/2" 15" x 12" x 12"

*Packaging only available online at

Maximum Weight Limit
Product Maximum Weight
Box A (top loading and side loading) 15 lbs.
Box B (top loading and side loading) 20 lbs.
Box C 25 lbs.

Priority Mail Regional Rate Boxes are available for Priority Mail commercial parcels and Merchandise Return Service (MRS) parcels returned at Priority Mail prices. The Regional Rate Boxes are available for Priority Mail Commercial Base and Commercial Plus customers online at This offering is not available for mailers using BRM, Parcel Return Service (PRS), or for customers who pay postage at retail Post Office locations. This 1-3 day service includes tracking. Priority Mail bearing an IMpb or retail tracking barcode includes $50 of insurance. Priority Mail bearing an IMpb paid at Commercial Plus prices includes $100 of insurance. Additional merchandise insurance up to $5,000 may be purchased for a fee.

Customers must use USPS-produced Priority Mail Regional Rate Boxes to qualify for Regional Rate Box pricing.

Hold For Pickup Service

Hold For Pickup service, Priority Mail items are held at a destination Post Office location for pick up by a specified addressee or designee. Upon arrival of the mailpiece at the destination Post Office pickup location, the addressee will receive an email notification from the Postal Service.

When sealing a Regional Rate Box, the container flaps must be able to close within the normal folds. Tape may be applied to the flaps and seams to reinforce the container; provided the design of the container is not enlarged by opening the sides and the container is not reconstructed in any way.

Online shipping convenience