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First Class

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/BusinessMail101?ViewName=FirstClassMail

Priority Mail

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/BusinessMail101/Index?ViewName=PriorityMail

Priority Mail Express

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/BusinessMail101/Index?ViewName=PriorityMailExpress

Periodicals

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/BusinessMail101/Index?ViewName=Periodicals

Standard Mail

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/BusinessMail101/Index?ViewName=StandardMail

Package Services

Please use the following link to view USPS definitions and size requirements.
http://pe.usps.com/BusinessMail101/Index?ViewName=PackageServices

First-Class Mail International

Please use the following link to view USPS definitions and size requirements.
https://www.usps.com/international/first-class-mail-international.htm