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USPS Priority Mail Flat Rate boxes are an easy-to-use, cost-effective shipping option. You can easily ship like the experts; just know the USPS Flat Rate box sizes, prices, and how it works before you buy.

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How Does USPS Flat Rate Shipping Work?

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The USPS Priority Mail Flat Rate service will ship your package anywhere in the U.S. in 1-3 business days for a flat fee. To ship with this service, follow these easy steps:

  1. Order free Flat Rate boxes from the USPS. You have to use the branded Flat Rate boxes to get the Flat Rate shipping price, and you can order them online or pick them up at your local Post Office.
  2. Sign up for a free Shippo account to access the best rates on USPS Flat Rate shipping and print your labels from the comfort of your office or home.
  3. Bonus! Determine if a USPS Flat Rate box is the cheapest option for the items you’re looking to ship, since it’s not always the most affordable choice.

What are the 2021 USPS Flat Rate Box Sizes and Prices?

Mar 24, 2021 'Many Post Offices have a P.O. Box section that is accessible 24 hours a day, seven days a week, for customer convenience. Though rare, homeless people have camped out in a Post Office lobby before. I am working on an app that contains a ListView of Cards. Each card is inside a Container and contains an image (with fixed height and width) and a text. I am not able to place the image correctly inside the Card. I want the image to cover the width of box. This is the code.

As you’ll see below, Shippo offers discounted shipping rates when compared to what you’d find at your local Post Office. No volume or coding requirements. To sign up for a free Shippo account, visit www.goshippo.com/register/.

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2021 USPS Priority Mail Flat Rate
Shippo vs. Retail Rates
ProductsDimensionsShippo Rate Retail RateSavings Using Shippo vs. Retail

% Savings with Shippo

Flat Rate Envelope12 ½” x 9 ½”$7.40$7.95$0.557%
Legal Flat Rate Envelope15” x 9 ½”$7.70$8.25$0.557%
Padded Flat Rate Envelope12 ½” x 9 ½”$8.00$8.55$0.556.5%
Small Flat Rate BoxOutside:

8 11/16” x 5 7/16” x 1 ¾”

Inside:
8 ⅝” x 5 ⅜” x 1 ⅝”

$7.90$8.45$0.556.5%
Medium Flat Rate Box – 1 (Top-Loading)Outside:

11 ¼” x 8 ¾” x 6”

Inside:
11” x 8 ½” x 5 ½”

$13.75$15.50$1.7511%
Medium Flat Rate Box – 2 (Side-Loading) Outside:

14” x 12” x 3 ½”

Inside:
13 ⅝” x 11 ⅞” x 3 ⅜”

$13.75$15.50$1.7511%
Large Flat Rate BoxesOutside:

12 ¼” x 12 ¼” x 6”

Inside:
12” x 12” x 5 ½”

$19.30$21.90$2.6012%

Is Priority Mail the Same as Flat Rate?

USPS Priority Mail is one of the most-popular service levels the Postal Service offers, and for good reason. It’s cost effective and encompasses three widely-used shipping options: Priority Mail Flat Rate (which we discuss above), Priority Mail weight-based, and Priority Mail Cubic.

To ship via Flat Rate, you need to use the Flat Rate branded boxes. To use Cubic and weight-based options, you will need to use your own packaging or USPS Priority Mail boxes.

Which is Cheaper: Flat Rate or Priority Mail?

Mac store download. Generally speaking, the USPS Flat Rate boxes are a great option for heavy items that are traveling long distances. We ran the numbers to find out exactly when you should use a Flat Rate box and when you should use your own packaging and ship via USPS Priority Mail weight-based or Cubic instead.

When to Use USPS Flat Rate Envelopes

  • USPS Flat Rate Envelopes are almost ALWAYS the cheapest option.
  • However, use your own envelope for packages weighing exactly 1 lb. and traveling locally.
  • And if your package weighs less than 1 lb., use your own envelope and ship via USPS First-Class Package Service.

Use your own envelope (NOT a Flat Rate envelope) for the following scenarios:

Flat Rate Envelope (12 1/2″ x 9 1/2″) – $7.40
Qualifications for Using Own PackagingCost to ShipSavings
Weighs 0.5-1 lb. and traveling less than 50 miles (Zone 0,1,2)$7.16$0.24
Legal Flat Rate Envelope (15″ x 9 1/2″) – $7.70
Qualifications for Using Own PackagingCost to ShipSavings
Weighs 0.5-1 lb. and traveling less than 600 miles (Zone 0-4)$7.16 – $7.67Up To $0.54
Padded Flat Rate Envelope (12 1/2″ x 9 1/2″) – $8.00
Qualifications for Using Own PackagingCost to ShipSavings
Weighs 0.5-1 lb. and traveling less than 600 miles (Zone 0-5)$7.16 – $7.88Up to $0.84
Weighs 2 lbs. and traveling less than 50 miles (Zone 0,1,2)$7.79$0.21

When to Use USPS Flat Rate Boxes

  • For 1 – 20 lb. packages, choose Flat Rate for long distances and your own box for short distances.
  • For <1 lb. packages, use your own box and ship via USPS First-Class Package Service.
  • For >20 lb. packages, use a Flat Rate box.

Use your own box (NOT a Flat Rate box) for the following scenarios:

Sm. Flat Rate Box (8 5/8″ x 5 3/8″ x 1 5/8″) – $7.90
Qualifications for Using Own PackagingCost to ShipSavings
Weighs 0.5-20 lbs. and traveling less than 600 miles (Zone 0-4)$7.16 – $7.81Up to $0.74
Med. Flat Rate Box (11 1/4″ x 8 3/4″ x 6″) – $13.75
Qualifications for Using Own PackagingCost to ShipSavings
Weighs 0.5-2 lbs. and traveling anywhere except U.S. Territories (Zone 0-8)$7.16 – $11.69Up to $6.59
Weighs 3-20 lbs. and traveling less than 1400 miles (Zone 0-6)$8.00 – $13.58Up to $5.75
Lg. Flat Rate Box (12 1/4″ x 12 1/4″ x 6″) – $19.30
Qualifications for Using Own PackagingCost to ShipSavings
Weighs 0.5-1 lb. and traveling to any U.S. State including Hawaii and Alaska$7.16 – $11.69Up to $12.14
Weighs 2-4 lbs. and traveling anywhere except U.S. Territories (Zone 0-8)$7.79 – $18.96Up to $11.51
Weighs 5-20 lbs. and traveling less than 1800 miles (Zone 0-7)$8.20 – $18.08Up to $11.10
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Keep in mind that the maximum weight is 70 pounds. And, when sealing a Flat Rate envelope or box, the container flaps must be able to close within the normal folds.

Is Priority Mail (Weight-based) or Flat Rate Faster?

Technically speaking, they are all part of the Priority Mail mail stream, so they all ship within 1-3 business days.

Are There Any Other Restrictions?

There are specific regulations and standards for mailing restricted, prohibited, and hazardous materials, including cigarettes and smokeless tobacco. You also can’t ship airbags, ammunition, explosives, or gasoline. For more details, visit the USPS Shipping Restrictions page.

How Do I Get a USPS Priority Mail Flat Rate Label?

It takes just a few minutes to set up a free Shippo account, and then you can print the label from your office or warehouse. (To get a clearer picture upfront of how you can save on USPS shipping rates by using Shippo, feel free to check out our USPS shipping calculator.) Affix the label to the USPS Priority Mail Flat Rate box. Then, put it in your mailbox or schedule a pick-up with your local mail carrier in the Shippo dashboard.

Make sure the label you’re using matches the packaging. For example, if you are using a Priority Mail Express Flat Rate box, you need to use a Priority Mail Express Flat Rate label.

If you liked this post, you may also be interested in a video that our co-founder Laura Behrens Wu did with the co-founder of packaging solution company Lumi on shipping with the USPS.

Shippo is a multi-carrier API and web app that helps retailers, marketplaces, and platforms connect to a global network of carriers. Businesses use Shippo to get real-time rates, print labels, automate international paperwork, track packages and facilitate returns. Shippo provides the tools to help businesses succeed through e-commerce shipping.

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Frequently Asked Questions

Below you'll find answers to some common questions around creating a custom box. Every order is little different though, so don't hesitate to reach out with anything else you might be wondering.

Can I get an instant quote for my order?

Yes, you can select your custom box style, size, material, and quantity on our free 3D box design tool to instantly view a quote for your project. As you upload artwork, add text, or color the background in each panel of the 3D model, you'll see your Unit Price update in real-time.

What if I'm designing in Adobe Illustrator?

If you're building your design on one of our Illustrator templates, you can submit your file on our Dieline Upload tool and a quote for your project will be sent to you ASAP. You can also email your dieline to our customer support team and we'll send you back a quote. If you do not have a design for your box yet, you can get a rough quote by applying a solid color on any panels of our 3D design tool where you will want your design printed.

How does your 3D box designer work?

If you have individual artwork elements such as logos, images or text, you can customize your box specifications directly on our 3D design tool and receive pricing on that same page. As you build your design on the 3D box model, you will see your Unit Price update in real-time to reflect any changes that affect your project's pricing. Once you have finalized your design, you can proceed directly to checkout, save your design for later, or even share your design with friends or colleagues!

What is the turnaround time on my order?

Our Standard turnaround for most custom box orders is around 10 business days and Rush turnaround is 7 business days. These turnarounds do not include transit time (1 - 7 business days depending on your location). Bulk or special custom orders may require a few extra days to get setup and produced. Please note that during extremely busy times of year some orders may take longer to complete. While delivery estimates cannot be guaranteed, all dates shown at checkout are the quickest estimate we offer. If your delivery date is time sensitive, we highly recommend choosing Rush production and expedited shipping.

What happens after I place my order? Do I get a proof before printing?

After checkout, our dedicated Prepress team will review your design for any technical concerns and send a 2D digital proof to your email within 24 hours. If any changes need to be made, you can send a note directly to our Prepress team through the proof page and they'll be happy to help with finalizing your design for printing.

Will I see a proof for my order?

All new orders will receive a digital proof within 24 hours of completing the checkout process.

How do I know if my art is printable?

Our dedicated in-house Prepress team will review your custom box design for any technical concerns (artwork resolution, blurriness, splits, thin lines, and bleeds) and if found, will note them for your attention in the proof. If you're unsure of how to fix any printing concerns that are noted, our Prepress representatives are happy to help you through the process. It's important to keep in mind that our team does not check for spelling or grammar errors, nor do they provide any subjective feedback on design content.

Can you print inside the box?

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Yes! We can print on the inside of any of our corrugated box styles. This includes Mailers, Shippers, and Tuck Tops (our secret menu box style!). Product boxes are currently limited to printing on the exterior only. You can even use our online box designer to design the inside of Mailer boxes. For Shippers and Tuck Tops, we currently require a 2D dieline template be submitted for both the interior and exterior so we can set up your order as a custom order. You can also submit designs this way for our Mailer boxes, if you prefer to build on a 2D Illustrator template instead of our free 3D box design tool.

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What choices affect my pricing?

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As a high-volume producer with scale economies, Packlane provides the industry's most competitive prices on custom printed boxes available. Pricing is generally a factor of five things: dimensions, box style, ink coverage on the box, box material, and quantity (higher quantities = bulk quantity savings). If you have questions about pricing or choices that can affect your order, our customer support team is happy to help!





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