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IMM Issue 37 - International Mail Manual >
2 Conditions for Mailing > 230 Priority Mail International
Priority Mail International service is considered a parcel stream for mail exchange purposes, with the exception of the flat-rate envelope and the small flat-rate box.
The maximum weight for items mailed using the flat-rate envelope and small flat-rate box is 4 pounds.
The weight limit for items mailed using the regular/medium and large flat-rate boxes is 20 pounds.
Weight limits for Priority Mail International service vary by country and are noted in the Individual Country Listings. However, the maximum weight limit for any Priority Mail International shipment is 70 pounds.
The minimum and maximum dimensions for Priority Mail International parcels are as follows:
For all parcels, length is the longest side of the parcel, and girth is the measurement around the thickest part that is perpendicular to the length. The following examples can assist mailers in determining length or length and girth combined for rectangular and nonrectangular parcels. See Exhibit 231.23.
Measuring Parcel Dimensions