Mailing Specifications

Shape Length Thickness Height
Postcard 5 inch min.   3-1/2 min.
  6 inch max.   4-1/4 inch max.
Letter 5 inch min. 1/4 inch 3-1/2 min.
  11-1/2 inch max. 3/4 inch 6-1/8 inch max.
Flat 11-1/2 inch min. 3/4 inch 6-1/8 inch min.
Parcel Weight cannot exceed 70 pounds. Length + girth (distance around the thickest part of the package) cannot exceed 108 inches. (Parcel Post cannot exceed 130 inches.)

Once a piece of mail exceeds the maximum length, height, or thickness of one shape, it automatically gets classified as the next largest shape.

 

For shipping weight and size and other helpful information
click here United States Postal Service.

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