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If the length (the dimension parallel to the address) of a letter-size mailpiece is not at least 5 inches, it is nonmailable. If the height (the dimension perpendicular to the length) of a letter-size mailpiece is not at least 3-1/2 inches, it is nonmailable.

The Postal Police Reform Act of 2023 would counteract Postmaster General DeJoy's 2020 directive and again allow Postal Police Officers to operate outside of Postal Service real property. “Letter carriers perform an essential service of our government, but delivering mail has become an increasingly dangerous job.

Mailpiece Dimensions SHAPEHEIGHTPostcardsminimum maximum3-1/2 inch min. 4-1/4 inch max.Lettersminimum maximum3-1/2 inch min. 6-1/8 inch max.Large Envelopesminimum maximum6-1/8 inch min. 12 inchesPackagesMaximum length plus girth 108 inches (130 inches for USPS Ground Advantage)

What are the USPS Restricted Items? Aerosols. Alcoholic beverages. Exceptions for mailing intoxicating liquors. Cigarettes, cigars, and tobacco. Cremated remains. Dry ice. Firearms. Fragile items.

Use enough 2-inch-wide packing tape to close and secure all seams. (But please don't wrap your box in string, cord, or twine, which gets caught in USPS sorting equipment.) Packages can't be larger than 130” total length (the longest side) + girth (the distance around the package, perpendicular to the length). How to Prepare & Send a Package - USPS usps.com https://.usps.com › ship › packages usps.com https://.usps.com › ship › packages

Envelopes must be rectangular and made of paper to qualify for letter prices. Your envelope can be a maximum of 11-1/2" long x 6-1/8" high. (A standard No. 10 envelope is 9-1/2" long x 4-1/8" high.) You can fold what you put in your envelope, but it needs to stay flat—no more than 1/4" thick. How to Send a Letter or Postcard: Domestic - USPS usps.com https://.usps.com › ship › letters usps.com https://.usps.com › ship › letters

Minimum: 3-1/2 inches high, 5 inches long, and either 0.007 inch thick if not more than 4-1/4 inches high and 6 inches long; or 0.009 inch thick if more than 4-1/4 inches high or 6 inches long, or both. Maximum for First-Class Mail card prices: 4-1/4 inches high, 6 inches long, and 0.016 inch thick. USPS Regulations and Specs for Letters and Postcards ad-vantagemarketing.com https://ad-vantagemarketing.com › mailing-resources › u... ad-vantagemarketing.com https://ad-vantagemarketing.com › mailing-resources › u...

You can't send these items in the U.S. mail: Air Bags. Ammunition. Explosives. Gasoline. Liquid Mercury. Marijuana (medical or otherwise); hemp/CBD is allowed, but restricted. Domestic Shipping Prohibitions, Restrictions, & HAZMAT - USPS United States Postal Service https://.usps.com › ship › shipping-restrictions United States Postal Service https://.usps.com › ship › shipping-restrictions