Medium and Large Flat Rate Boxes, 20 lbs.ģ First-Class Mail International maximum weights: Letters, 3.5 ounces.
Complete tables of prices are available in Notice 123, Price List.ġ Priority Mail Express International Flat Rate Envelopes maximum weight: 4 lbs.Ģ Priority Mail International Flat Rate Service maximum weights: Flat Rate Envelopes and Small Flat Rate Priced Boxes, 4 lbs. Listed below are the countries and their price groups and weight limits for the five principal categories of international mail. USPS Marketing Mail Eligibility Decision Tree.Designing Letter and Reply Mail (PUB 25).
