Domestic rates are calculated by package weight and zones.
International rates are calculated by package weight and Country Group.
There are restrictions for mailing restricted, prohibited, and hazardous materials, including cigarettes and smokeless tobacco. See USPS Shipping Restrictions for up-to-date information on item limitations.
The maximum weight for domestic labels purchased through an online shipping service is less than 16 oz.
Maximum weight for international shipments: up to 4 lbs.