what is first class mail rate?
Priority Mail International Flat Rate; First-Class Mail International; First-Class Package International Service; Airmail M-Bags; Add Insurance & Extra Services; Understand Shipping Tools; ... You can add the following options to all First-Class Mail® ... - read more
Minimum Weight: None. Maximum Weight: 13 ounces (over 13 ounces, First-Class Mail becomes Priority Mail). Letter Maximum Weight: 3.5 ounces. Minimum Quantity to Mail at Commercial Prices: 500 pieces. - read more
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