
The USPS Priority Mail Flat Rate Box is a popular shipping option for its convenience and affordability. It's a free box that you can use to ship packages up to 70 pounds.
To use the Priority Mail Flat Rate Box, you simply need to fill it with your items, weigh it, and affix the correct postage. The weight limit is 70 pounds, and the dimensions are 8.5 x 5.5 x 1.5 inches.
The flat rate pricing means that you pay the same rate regardless of the destination within the United States. This can be a big cost savings, especially for packages that weigh under 70 pounds.
You can buy the Priority Mail Flat Rate Box at any USPS location, or you can request one to be mailed to you.
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What Is USPS Priority Mail?
USPS Priority Mail is a fast and affordable way to send packages within the United States. It's ideal for both personal and business use.
The US Postal Service offers a range of Priority Mail services, including flat rate boxes, which make it easy to calculate shipping costs. This eliminates the need to weigh and measure packages.
One of the key benefits of USPS Priority Mail is its speed, with delivery times ranging from 1-3 business days, depending on the destination. This is faster than regular first-class mail.
USPS Priority Mail also offers tracking and insurance, giving you peace of mind that your package will arrive safely. This is especially important for valuable or time-sensitive items.
The flat rate box is a convenient option, offering a set price regardless of the weight of the package. This makes it easy to budget for shipping costs.
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Box Options
USPS Priority Mail flat rate boxes come in various sizes to suit different needs. The small flat rate box measures 8 11/16″ x 5 7/16″ x 1 ¾” and is great for small items.
There are three main box sizes: small, medium, and large. The medium flat rate box is 11 ¼” x 8 ¾” x 6″ and is good for bigger items. The large flat rate box is 12 ¼” x 12″ x 6″ and is best for big, bulky items.
Here's a quick summary of the box sizes and their recommended uses:
- Small Flat Rate Box: Best for items weighing 1-20 lbs and traveling to zones 5-9
- Medium Flat Rate Box: Best for items weighing 3-20 lbs and traveling to zones 7-9
- Large Flat Rate Box: Best for items weighing 5-20 lbs and traveling to zones 8-9
What Is USPS Priority Mail Flat Rate Box
The USPS Priority Mail Flat Rate Box is a game-changer for shipping. It's designed to make shipping easier and more affordable, with a variety of box sizes to fit different needs.
The Priority Mail Flat Rate Box has eight different sized options, all of which can handle a maximum weight of up to 70 lbs.
One of the key benefits of the Priority Mail Flat Rate Box is that the shipping rates are the same no matter where you're sending it, as long as it's within the continental United States. The prices range from $8.51 to $19.51 for Shippo rates.
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Here are the different sizes of the Priority Mail Flat Rate Box:
- Small Flat Rate Box: 8 11/16″ x 5 7/16″ x 1 ¾”
- Medium Flat Rate Box: 11 ¼” x 8 ¾” x 6″
- Large Flat Rate Box: 12 ¼” x 12″ x 6″
The right box size is key to saving money. For example, a small flat rate box is a big saver for light items, weighing 1-20 lbs and traveling to zones 5-9.
The Priority Mail Flat Rate Box is also great for bulkier items, such as jewelry, small electronics, and more. The boxes have self-adhesive flaps that need to be able to fully close, and they're designed to prevent bulging.
Here's a quick look at the different types of Priority Mail Flat Rate Boxes and Envelopes:
By choosing the right box size, you can save money on shipping rates and make your shipping experience more efficient.
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Medium
The Medium box is a great option for shipping a variety of products. It's available in two versions: top-loading and side-loading.
The top-loading Medium box has an outside size of 11 1/4″ x 8 3/4″ x 6″, and an inside size of 11″ x 8 1/2″ x 5 1/2″.

You can use the top-loading Medium box to ship shoes, as it provides a good balance of space and size.
The side-loading Medium box has an outside size of 14″ x 12″ x 3 1/2″, and an inside size of 13 5/8″ x 11 7/8″ x 3 3/8″.
The side-loading box is great for shipping dozens of printed ebooks to partners, as it offers a bit more inside space.
Here's a comparison of the two Medium box sizes:
Remember to compare the costs of the Medium box to other weight-based shipping options, as there may be instances where weight-based shipping is cheaper.
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Shipping Options
USPS Priority Mail Flat Rate boxes offer several shipping options to choose from. You can select from two different sizes of Regional Rate boxes, which provide a flat rate for packages up to 15 or 20 pounds, depending on the box size.
The Regional Rate boxes come in two sizes, A and B, with different dimensions. For example, Regional Rate Box A has dimensions of 10-1/8″(L) x 7-1/8″(W) x 5″(H) outside and 10″(L) x 7″(W) x 4-3/4″(H) inside.
USPS Priority Mail Flat Rate boxes also offer fast and reliable shipping, with a promise of delivery in 1-3 business days for most places. This speed is backed by USPS service commitments, so customers can count on it.
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Large

The Large shipping option is a great choice for sending items to loved ones. It's specifically designed for sending items to troops and military personnel stationed overseas.
The USPS Priority Mail APO/FPO/DPO Large Flat Rate Box has the same dimensions as the USPS Flat Rate Large Box. This means it's a convenient and straightforward option.
This package type includes a message of support for military troops, which can be a thoughtful touch. It also offers a discounted postage rate for the shipping service, making it a more affordable option.
The 70-pound limit of the Large Flat Rate Box is a significant advantage, allowing you to send larger items.
Regional Shipping
Regional Shipping offers a variation of USPS Priority Mail Flat Rate, providing a flat rate for up to 15 or 20 pounds, depending on the box option used.
Regional Rate takes distance traveled into account, unlike USPS Flat Rate, making it a more cost-effective option for some shipments.

The savings can be substantial when Regional Rate wins out, so it's worth comparing it to other shipping methods.
For example, Regional Rate Box A wins out for almost every Zone up to 15 pounds when compared to Medium & Large Flat Rate Boxes.
Here's a comparison of Regional Rate Box B and Medium & Large Flat Rate Boxes for up to 20 pounds:
Regional Rate Shipping Boxes come in two different versions, A and B, each with their own dimensions and weight limits.
USPS Priority Mail Regional Rate A1 dimensions are 10-1/8″(L) x 7-1/8″(W) x 5″(H) outside and 10″(L) x 7″(W) x 4-3/4″(H) inside.
Services Shipping Options
USPS offers flat rate shipping for Priority Mail and Priority Mail Express, making shipping easier and more convenient.
Flat rate shipping is available for packages up to 70 pounds, offering a fixed rate for shipping. This can be a significant advantage for businesses and individuals who need to ship packages regularly.
USPS Priority Mail Flat Rate boxes ship fast, usually in 1-3 business days, and are backed by USPS service commitments. This means customers can count on delivery within the promised time frame.
For big, heavy items going far, flat rate boxes are often cheaper than weight-based shipping. However, for lighter packages going short distances, weight-based shipping might save money.
Here's a comparison of flat rate boxes with other shipping methods:
This table helps businesses pick the right shipping method, saving money and making customers happier.
Shipping Details
USPS Priority Mail Flat Rate boxes ship fast, usually in 1-3 business days.
The delivery time depends on where the package starts and ends. Packages sent within the same area usually arrive in one business day.
For big, heavy items going far, flat rate boxes are often cheaper.
Here's a summary of the shipping details for major carriers:
Tracking Number with Shipments
Tracking a package can be a relief, especially if you're sending something important. A tracking number comes with every USPS Flat Rate shipment, so you can keep tabs on where it is.
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You can also automate the tracking number to be sent to your customer, so you both stay informed about the shipment's progress. This way, you can avoid any confusion or delays.
USPS Tracking is built-in with Priority Mail Flat Rate, so you don't need to worry about additional fees or hassle. This means you and the receiver can both stay updated on the package's status.
USPS also offers built-in insurance for Priority Mail Flat Rate, with coverage limits and a claim process. This gives you peace of mind, knowing that your package is protected in case something goes wrong.
Shipping Time & Delivery Specs
USPS Priority Mail Flat Rate boxes are a great option for fast and reliable shipping.
They promise delivery in 1-3 business days for most places, backed by USPS service commitments.
Packages sent within the same area usually arrive in one business day.
Those going further away might take up to three days, so it's essential to know this for businesses and individuals who need their packages on time.
Packing and Shipping
Packing your USPS Priority Mail Flat Rate Box is a breeze, and following some simple tips will ensure your items arrive safely.
Choose the right box size for your items, as this will help prevent damage during shipping. Use adequate packing materials, such as bubble wrap or foam inserts, to keep your items secure.
Seal the box correctly, making sure the flaps can close within the normal folds. This will prevent any damage or shifting during transit.
Here are the weight limits and shipping costs for each box size:
Following these packing tips and shipping guidelines will ensure a safe and successful delivery.
How to Pack
Packing your items carefully is crucial to ensure they arrive safely at their destination. Choose the right box size for your items.
The size of the box you need will depend on the size and weight of the items you're shipping. Use adequate packing materials, such as bubble wrap or foam inserts, to prevent damage during shipping.
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Sealing the box correctly is also important. Make sure the flaps can close within the normal folds. This will help prevent the box from opening during transit.
Here are the weight limits and shipping costs for USPS Priority Mail Flat Rate Boxes:
By following these packing tips and guidelines, you can ensure a safe and successful delivery of your items.
Understanding
USPS Priority Mail Flat Rate boxes are a great way to ship packages in the United States. They offer flat rate packaging, which means shipping costs are based on the box size, not the package weight.
These boxes are perfect for businesses and individuals who want to make shipping easier. They come in different sizes, including a Small Flat Rate Box that costs $10.20 and a Large Flat Rate Box that is $22.80.
The USPS has different types of Priority Mail Flat Rate boxes and envelopes, so you can choose the one that best fits your needs. Plus, they ship fast, usually in 1-3 days.
One of the best things about Priority Mail Flat Rate is that you don't need to weigh packages, making shipping easier.
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Comparison and Costs

The cost of USPS Priority Mail Flat Rate is fixed at $7.70 for all domestic destinations.
You can fit as much as you can into the box as long as it's under 70 pounds, making it a convenient option for shipping.
The service includes a range of shipping supplies, including flat rate boxes, which can be ordered online or at most Post Office facilities.
The flat rate postage amount of $7.70 applies to all domestic destinations, and various methods can be used for postage payment, including stamps and meter strips.
Here's a comparison of the shipping carriers:
Comparing Shipping Methods
Comparing shipping methods can be a daunting task, but it's essential to get it right. You need to consider the weight and size of your package, as well as the distance it's traveling.
For big, heavy items going far, flat rate boxes are often cheaper. This is because they offer a fixed rate for shipping, regardless of the distance. I've seen businesses save a significant amount of money by using flat rate boxes for their larger shipments.
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USPS Priority Mail is a popular choice for businesses, promising delivery in 3 days, no matter the distance. This is a great option for businesses that need to get their packages delivered quickly.
Other carriers like FedEx and UPS also offer flat-rate shipping. FedEx has options like overnight and 2-day delivery, while UPS offers Ground, 3-Day Select, and 2nd Day Air.
Here's a comparison of the weight limits and shipping speeds for each service:
By considering these factors, businesses can pick the right shipping method and save money. It's also a great way to make customers happier by getting their packages delivered quickly and efficiently.
Key Takeaways
USPS Priority Mail flat rate shipping offers a fixed fee for packages up to 70 pounds. This makes it a convenient and cost-effective option for individuals and businesses alike.
The fixed rate postage amount of $7.70 applies to all domestic destinations. This predictable pricing is a major advantage of using flat rate shipping.

You can order boxes online or at most Post Office facilities. This makes it easy to get the supplies you need when you need them.
Flat rate shipping also offers fast delivery times, usually in 1-3 days. This is a significant benefit for customers who need their packages quickly.
Here are some key details about USPS Priority Mail flat rate shipping:
- Fixed fee for packages up to 70 pounds
- Range of shipping supplies, including flat rate boxes
- Predictable pricing and fast delivery times
- Fixed rate postage amount of $7.70 for all domestic destinations
- Boxes can be ordered online or at most Post Office facilities
- Various methods available for postage payment, including stamps and meter strips
When to Use
The USPS Priority Mail Flat Rate Box is a great option for sending packages, but when to use it is just as important as how to use it.
For packages weighing up to 70 pounds, the flat rate box is a great choice.
You can use the flat rate box for shipping items that are fragile, as it provides extra cushioning and protection.
It's perfect for sending gifts, as it's easy to use and the recipient won't have to pay extra for shipping.
The flat rate box is also a good option for shipping items that are irregularly shaped, as it can accommodate a wide range of sizes and shapes.
It's a great way to send packages to Alaska and Hawaii, as it's a flat rate and you won't have to worry about extra shipping costs.
Frequently Asked Questions
Is it cheaper to use a flat rate box or your own box USPS?
Using a flat rate box is often more expensive than shipping with your own box or a free Priority Mail Mailing Box, especially for lighter packages. Check the weight and dimensions to see which option is cheaper for your specific shipment.
Sources
- https://shippingeasy.com/blog/what-are-usps-flat-rate-boxes/
- https://www.quadientdirect.com/blog/post/flat-rate-boxes-sizes-prices-and-benefits
- https://uspsprioritymailboxes.com/usps-priority-mail-flat-rate-box/
- https://www.stamps.com/usps/priority-mail-flat-rate/
- https://www.shipstation.com/blog/what-is-usps-flat-rate-and-when-should-i-use-it/
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