Prepare International Mail*

Many household items can’t go in international mail.

Hazardous materials include…

• Perfumes
• Nail polish
• Aerosols
• Bleach
• Pool chemicals
• Paints
• Matches
• Some batteries
• Certain glues
• Fireworks

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Standard Shape and Size Guidelines for International Mail

First Class Mail International™ Large Envelopes

• Package prices apply if any of these three dimensions are exceeded; if they are square, lumpy or rigid, have clasps or similar closures, have an address that is written parallel to the shorter edge, and if they are more than 6" long, 4 1/4" high, or less than 0.009" thick.
• Light-colored envelopes are required.

First Class Mail International™ Letters

• Extra postage is needed for envelopes if they are square, lumpy or rigid, have clasps or similar closures, have an address that is written parallel to the shorter edge, if their length divided by their height is less than 1.3 or more than 2.5.
• Some countries have additional size and weight restrictions.

First Class Mail International™ Postcards

• Maximum thickness is 0.016".

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Country-Specific Restrictions on Postal Explorer^®
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See recent international service updates ›