USPS Flat Rate Box Sizes report

US Post officeUSPS is an independent agency of the United States Federal Government. The United States Postal Service has the largest civilian fleet globally and handles more than 16 billion letters worldwide each year. The lightweight American Express enjoys a considerable discount, and the express delivery fee is very cheap.

Priority Mail Flat Rate is a 1 to 3-day shipping service provided by the USPS that features one flat rate for delivery of a package or envelope to its destination. Flat rate pricing eliminates the need to weigh packages or calculate shipping fees, as long as the parcel weighs less than 70 lbs.

If you are shipping heavy, small items, Flat Rate Boxes are the best bang-for-your-buck option. Using a USPS Flat Rate Box can cut your shipping costs by 50%. The premise is that you choose the right box size according to your needs. This is a great way to prepare for peak shipping. The following article can find more details about the USPS Priority Mail Flat Rate options' sizes and prices.

What are USPS Flat Rate Boxes

USPS Flat Rate Boxes are boxes with flat postage rates, no matter how heavy the box is. Priority Mail Flat Rate is a 1 to 3-day shipping service provided by the USPS that features one flat rate for delivery of a box or envelope. The service allows a maximum weight of 70 lbs. Its packaging options include envelopes and boxes in various sizes. Each box or envelope features one low flat rate, so pricing is determined by the box or envelope you choose and not by the weight or distance the package is traveling.

USPS Delivery

USPS Flat Rate Boxes Guide

USPS Priority Mail services are delivered reliably and cost-effectively to more than 180 countries or regions, including Canada, Mexico, and Australia. It allows you to pay a single rate regardless of package weight and distance traveled, up to 70 pounds.

  • Options: Use free flat-rate boxes and envelopes. Envelopes and small boxes do not exceed 4 lbs, medium and large boxes do not exceed 20 lbs or ship packages that exceed 70 lbs by weight.
  • In addition to flat-rate, prices also vary by destination country or region, starting at $45.95.

USPS Flat Rate Options

TypeSize(L x W x H)Postal
Letter Envelope12 1/2" x 9 1/2"Single/Pack of 10
Window Envelopes10" x 5"Pack of 10
Small Envelopes10" x 6"Pack of 10
Padded Envelopes12 1/2" x 9 1/2"Pack of 5, 10, 15
Legal Envelopes15" x 9 1/2"Pack of 10
Small Box8 11/16" x 5 7/16" x 1 3/4"Single/Pack of 10 or 25
Medium Box-1
11 1/4" x 8 3/4" x 6"Single/Pack of 10 or 25
Medium Box-214 1/8" x 12" x 3 1/2"Single/Pack of 10 or 25
Large Box12 1/4" x 12" x 6"Single/Pack of 10 or 25
Large Board Game Box24 1/6" x 11 7/8" x 3 1/4"Pack of 25
APO/FPO Box12 1/4" x 12" x 6"Pack of 10 or 25

USPS Flat Rate Box Sizes

Keep in mind that your items also fit comfortably inside the USPS Priority Mail boxes without any bulging. You have to use USPS-branded boxes to take advantage of this shipping service.

USPS Flat Rate Boxes

USPS Flat Rate Small Box

  • Outside: 8 11/16″ x 5 7/16″ x 1 3/4″
  • Inside: 8 5/8″ x 5 3/8″ x 1 5/8″

USPS Flat Rate Medium Box

  • Medium Box-1 Specs (top-loading): Outside: 11 1/4″ x 8 3/4″ x 6″; Inside: 11″ x 8 1/2″ x 5 1/2″
  • Medium Box-2 Specs (side-loading): Outside: 14″ x 12″ x 3 1/2″; Inside: 13 5/8″ x 11 7/8″ x 3 3/8″

USPS Flat Rate Large Box

  • Outside: 12 1/4″ x 12 1/4″ x 6″
  • Inside: 12″ x 12″ x 5 1/2″

USPS Flat Rate APO/FPO/DPO Boxes

  • Outside: 12 1/4″ x 12 1/4″ x 6″
  • Inside: 12″ x 12″ x 5 1/2″

There is no doubt that shipping with Priority Mail Flat Rate boxes or envelopes can save you money. One of the greatest conveniences of the flat-rate package type is that you can order the shipping supplies from USPS for free, and they’ll deliver your order to your home or office free of charge.

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