USPS and UPS Packages

Before shipping your item, it’s important to check the size and type of package you’re sending, so you can offer the best shipping options to your buyers.

When packing your item, consider how large the packaging is, and which shipping service you’ll use.

Package sizes

When selecting your package type, you can choose from letter, large envelope, package (or thick envelope), or large packages. When measuring, the length is the longest side of the package, and the girth is the distance around the 2 smaller sides.


A letter ranges between:

* Minimum: 5 inches long, 3-1/2 inches high, and 0.007 inches thick

* Maximum: 11-1/2 inches long, 6-1/8 inches high, and 1/4 inch thick



A large envelope ranges between:

  • Minimum: 11-1/2 inches long, 6-1/8 inches high, and 1/4 inch thick
  • Maximum: 15 inches long, 12 inches high, 3/4 inch thick

PACKAGE (or thick envelope)

  • A package is a parcel (or box) less than 84 inches when you add the length plus girth 
  • A thick envelope is a large envelope exceeding 3/4 inch thickness

Note: For large UPS packages, you may need to enter dimensions to calculate costs correctly.


A large package is a parcel (or box) whose length plus girth is over 84 inches, and less than or equal to 165 inches.

You can only send packages with length plus girth between 130 inches and 165 inches through UPS. For large UPS packages, you might need to enter dimensions to calculate costs correctly.

Irregular packages

If your shipment can’t be sorted with mail processing equipment because of its size, shape, content, or address legibility, additional charges may apply.



If you’re shipping with Parcel Select, you may need to select Irregular packages when you sell your item. For all other USPS shipping services, additional charges will be calculated automatically, or they don’t apply.


Select Irregular packages if you’re using Parcel Select and your package is one of the following:

  • Larger than 34 inches long, or 17 inches wide, or 17 inches high
  • A square envelope
  • An envelope on which the address is written parallel to the shorter edge
  • A glass container with more than 24 ounces of liquid
  • A metal container with 1 or more gallons of liquid
  • A plastic container with 1 or more gallons of liquid
  • An insecurely wrapped parcel
  • A metal banded parcel
  • A wooden or metal box
  • A tube or roll
  • A book, printed matter, or business forms weighing more than 25 pounds
  • A high-density parcel weighing more than 15 pounds and exerting more than 60 pounds per-square-foot pressure on its smallest side
  • A film case weighing more than 5 pounds or with strap-type closures, except any film case the USPS authorizes to be entered as a machinable parcel and to be identified by the words “Machinable in United States Postal Service Equipment” permanently attached as a nontransferable decal in the lower right corner of the case



When shipping with UPS, select Irregular packages if any of the following apply:

  • The longest side of your package is over 60 inches or the second longest side is over 30 inches
  • The package is encased in an external shipping container made of metal or wood
  • The package is a cylindrical item, such as a barrel, drum, pail, or tire that isn’t fully encased in a corrugated cardboard shipping container.