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First Class

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/businessmail101/classes/firstClass.htm

Priority Mail

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/businessmail101/classes/priority.htm

Priority Mail Express

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/businessmail101/classes/express.htm

Periodicals

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/businessmail101/classes/periodicals.htm

Standard Mail

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/businessmail101/classes/standard.htm

Package Services

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/businessmail101/classes/packageServices.htm

First-Class Mail International

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/text/Imm/immc2_016.htm#ep2368097