First-Class Mail

From CAGwiki

Postcards, letters, and large envelopes can be sent using First-Class Mail. This service, along with Priority Mail and Express Mail, can be used for personal correspondence, handwritten or typewritten letters, and bills or statements of account. It may also be used for advertisements and lightweight merchandise. The weight limit for First-Class Mail is 13 ounces. For heavier items, use Priority Mail.

External links

• First-Class Mail on official USPS site
• USPS Official Website