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IMM Issue 37 - International Mail Manual >
2 Conditions for Mailing > 270 Free Matter for the Blind or Other PhysicallyHandicapped Persons > 273 Weight and Size Limits
For First-Class Mail International items (including Priority Mail International flat-rate envelopes and small flat-rate boxes), the weight limit is 4 pounds.
For Priority Mail International items (excluding the flat-rate envelope and the small flat-rate box), the weight limit is 15 pounds.
Note: The 15-pound weight limit for Priority Mail International parcels also applies to any USPS-produced flat-rate packaging that may have higher maximum limits when not mailed as Free Matter for the Blind or Physically Handicapped.
For First-Class Mail International items, see 241.2.
For Priority Mail International parcels, see 231.2.