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IMM Issue 34 - International Mail Manual >
2 Conditions for Mailing > 230 Priority Mail International > 232 Priority Mail International Flat-Rate EnvelopePostage
The Priority Mail International flat-rate envelope is charged at a flat rate. The price does not depend on the weight of the item. Postage is required for each piece. Priority Mail flat-rate envelopes with prepaid postage may be used for international mail. Appropriate additional postage must be added prior to mailing. (See Exhibit 232.1.)
Priority Mail International Flat-Rate Envelope
Canada & Mexico
All other countries
The weight limit for the flat-rate envelope is 4 pounds.
All Priority Mail International flat-rate envelopes must bear PS Form 2976 or 2976-A depending on value.