Get DMM 233 First-Class Mail Prices And Eligibility For ... - USPS

This has been the standard for a number of years. For a mailpiece to be eligible for First-Class Mail letter rates, it must be at least 3-1/2 inches by 5 inches by 0.007-inch thick, and no more than 6-1/8 inches by 11–1/2 inches by 1/4-inch thick.

The Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM) provides the United States Postal Service's official prices and standards for all domestic mailing services. Many commercial mailers find it helpful to reference these standards as they prepare and enter mailings.

First Class Mail is the most common and affordable way to send envelopes and lightweight packages. Anything you send to customers, including bills, invoices, correspondences and merchandise can be sent via First-Class, as long as your letters weigh less than 3.5 ounces. and your parcels weigh less than 13 ounces.

To qualify for First Class Mail, your envelope must be less than 13 ounces and not more than 15 inches long or more than 12 inches high or more than 3/4 inch thick; otherwise, you'll use USPS First Class Package Service.

What is USPS First Class Package Service? USPS First Class Package Service allows you to ship lightweight packages that weigh up to 15.999 ounces. As for dimensions, a First Class Package can have a maximum combined length and girth of 108 inches. Items can be sent in an envelope, poly mailer, or plain or branded box.

Maximum weight for First-Class Mail letters is 3.5 oz; for large First-Class Mail envelopes, the maximum weight is 13 oz.

USPS First Class Mail is an economical way to ship parcels and thick envelopes weighing under 16 oz. With retail rates, the maximum weight is 13 ounces.

The maximum weight for a USPS package is 70 lbs. Also, there are some things that you can't send at all (prohibited) and other things you can only send under certain conditions (restricted). Hazardous materials (HAZMAT) might be prohibited or restricted.