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What Can You Put In A Flat Rate Envelope

By David Krug 4 minute read

The Priority Mail Flat Rate Envelope is a popular mail item from the US Postal Service. There is a single low flat rate for these envelopes, which are available in seven different sizes.

There is no weight or distance factor to consider when it comes to determining a package’s cost.

Thus, you can save a great deal of money. To learn more about Flat Rate Envelopes and how to use them effectively, read on.

Restrictions on USPS Flat Rate Envelopes by 2022.

There is a single flat-rate fee for USPS Flat Rate Envelopes. The cost of postage is based on the envelope type, not the weight or distance of the package. Flat Rate envelopes are also the most cost-effective method of shipping. Flat Rate pricing is only available for envelopes that weigh less than 70 lbs. and have a maximum dimension of 108 inches.

Please continue reading if you’d like to learn more about the different types of envelopes that are available, how much they cost, and what items can be shipped in Flat Rate envelopes!

What Flat-Rate Envelopes Are There To Choose From?

Flat-rate envelopes from the United States Postal Service come in a variety of sizes. Envelopes come in a variety of shapes and sizes and can be used for a variety of purposes.

Type of EnvelopesDimensionsBest For
Priority Mail Small Flat Rate Envelope10 inches x 6 inches (with the flap closed)Letters, cards and small documents like passports.
Priority Mail Flat Rate Envelope12.5 inches x 9.5 inches (with the flap closed)Documents, clothes
Priority Mail Window Flat Rate Envelope (Small)10 inches x 5 inches (with the flap closed)Letters and other small documents like passports.
Priority Mail Window Flat Rate Envelope (large)12.5 inches x 9.5 inches (with the flap closed)Full-page documents and large pre-addressed envelopes.
Priority Mail Padded Flat Rate Envelope12.5 inches by 9.5 inches (with the flap closed)Any items that need extra padding, manila envelopes
Priority Mail Legal Flat Rate Envelope15 inches x 9.5 inches (with the flap closed)Legal size documents

Do Flat Rate Envelopes Cost a Lot?

Flat-rate envelope postage is broken down as follows:

Envelope TypePrice
Priority Mail Small Flat Rate Envelope$8.70
Priority Mail Flat Rate Envelope$8.70
Priority Mail Window Flat Rate Envelope (both sizes)$8.70
Priority Mail Padded Flat Rate Envelope$9.30
Priority Mail Legal Flat Rate Envelope$9.00

Also, bear in mind that the above-mentioned prices include postage. There is no charge for the envelopes.

You can either pick up a supply of free Flat Rate envelopes at the post office the next time you go or order them online from the USPS website.

How Do I Put Stamps On A Flat-Rate Envelope?

When it comes to purchasing and applying postage to a Flat Rate envelope, you have several options.

With the Click-N-Ship service or a pre-paid label from a company like eBay or Poshmark, you can use a combination of stamps equaling the postage price, or buy and print postage at home.

When Is It Appropriate To Use A USPS Flat-Rate Envelope?

Flat Rate Envelopes from the United States Postal Service (USPS) are almost always the cheapest method of shipping, but there are a few exceptions.

As long as the package weighs exactly 1 lb and is being transported locally, you should use your own envelope.

It’s best to ship small packages (under one pound) in your own envelope with USPS First-Class Package Service.

Which Size Flat Rate Envelope Can I Use?

All Flat Rate items have the same maximum dimensions (envelopes and boxes).

A total of 108 inches should be the maximum combined length and girth for these products.

Keep in mind that Flat Rate Envelopes’ flap and seals must be able to close within the normal fold range, even though you won’t get to the maximum dimensions.

Depending on the weight of the envelope and the zone to which you’re mailing, USPS may charge you more if you have to use a lot of tape to close your envelope. Flat-rate pricing will not be available.

Domestically, the maximum weight limit for Flat Rate Envelopes is 70 pounds, while the international weight limit is 4 pounds.

What Can Be Placed Inside A USPS Flat Rate Envelope?

“If it fits, it ships,” as the saying goes with the United States Postal Service. There is no need to stretch the envelope or use excessive tape to seal it, so you can put just about anything inside. It’s fine if the envelope has a few bumps in it.

Flat Rate Envelopes can hold a variety of items in addition to documents, such as clothing, shoes, and even small children’s toys.

What Cannot Be Placed Inside A USPS Flat Rate Envelope?

For Flat Rate Envelopes, as with any piece of mail, there are prohibited and restricted items.

Prohibited and restricted items can be found in the following list. Note that this is not an exhaustive list.

Visit the USPS website for more information if you have any concerns or questions about something you’re mailing.

Among the items that are not permitted are the following:

  • Bags of air
  • Ammunition
  • Explosives
  • Gasoline

The drug weed (medical or otherwise)

Following is a list of prohibited items:

  • Drinks that contain alcohol
  • Sanitizer for hands
  • Lithium-ion battery
  • Paint
  • Perfume

Bottom Line

Use USPS Flat Rate Envelopes when you need to ship anything from documents to clothing to toys quickly and at a low cost. Flat Rate envelopes come in seven different sizes, making it easy for every USPS customer to find the right one for their item.

Using Flat Rate Envelopes also has a lot of leeway when it comes to the rules. Basically, if your envelope weighs less than 70 pounds, has a maximum dimension of 108 inches, is self-closing, and does not contain prohibited items, you are free to mail anything you want.

David Krug