
The USPS Priority Mail Flat Rate Envelope is a convenient and cost-effective way to send packages. You can send packages up to 70 pounds.
One of the best things about the Priority Mail Flat Rate Envelope is that it's free to print postage online. This can save you a trip to the post office.
The envelope is available in two sizes: 6.5 x 11.5 inches and 12.5 x 11.5 inches. This gives you flexibility when choosing the right size for your package.
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Benefits of Using
Using a USPS Flat Rate Envelope can save you money on shipping costs.
The cost of shipping is predictable and consistent, making it easier to budget.
It's likely that you already know a couple of these benefits, but it's worth mentioning that the USPS Flat Rate Envelope is a convenient option for businesses.
The flat rate service is available for both domestic and international shipping, making it a versatile option.
You can send packages up to 70 pounds with the USPS Flat Rate Envelope.
This service is especially useful for businesses that need to send a high volume of packages.
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Delivery
The delivery times for USPS Priority Mail Flat Rate shipping are quite impressive. Typically, it takes 1-3 business days, depending on the destination.
This makes it a reliable option for businesses that require timely deliveries without the premium price of express shipping. I've seen firsthand how this can be a game-changer for companies that need to get their products to customers quickly.
USPS's Priority Mail Service comes with unique features and advantages, including faster delivery time. Usually, it delivers in two to three business days.
Priority delivery also entitles your mailers to special handling from the USPS, which means they're sorted quicker and minimizes the chances of damage to your mail. This is a big plus for businesses that rely on mailers to get their products to customers.
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Envelope Options
The USPS Priority Mail Flat Rate Envelope offers a range of options to suit your shipping needs. There are five distinct types of Priority Mail Flat Rate Envelopes and three types of Priority Mail Express Flat Rate Envelopes available.
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You can choose from a variety of flat rate boxes and envelopes, including options like the Flat Rate Envelope, Legal Flat Rate Envelope, Padded Flat Rate Envelope, and more.
The Small Flat Rate Envelope is ideal for sending small documents, such as letters and cards. It's also great for sending oversized greeting cards and gift cards.
The dimensional measurements of the Priority Mail Small Flat Rate Envelope are 10 inches in length and 6 inches in height.
Here are the different types of Priority Mail Flat Rate Envelopes you can choose from:
- Flat Rate Envelope
- Legal Flat Rate Envelope
- Padded Flat Rate Envelope
Cost and Packaging
The cost of using a USPS Priority Mail Flat Rate Envelope is a flat rate of $8.95 for the Post Office Rate, regardless of the size or weight of the envelope.
You can choose from various types of Flat Rate Envelopes, including the Priority Mail Flat Rate Envelope, Window Flat Rate Envelope, Small Flat Rate Envelope, Padded Flat Rate Envelope, and Legal Flat Rate Envelope.

The Commercial Base Rate for these envelopes is $7.75, which is a lower rate for businesses that purchase postage in bulk.
Here's a breakdown of the costs for each type of Flat Rate Envelope:
The weight and distance of the envelope do not affect the cost, making it a convenient option for businesses and individuals alike.
Shipping Services
Shipping with the USPS Priority Mail Flat Rate Envelope is a breeze. Simply select the right flat rate package for your items and the cost is fixed.
You can send items using the Priority Mail Express Padded Flat Rate Envelope, which offers faster service than Priority Mail.
The Priority Mail Flat Rate service is easy to use, and you can even get a free package pick-up from the USPS at your home or office once your package is ready to be shipped.
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Express Padded
Express Padded shipping services are a convenient option for sending packages quickly and efficiently.
The Priority Mail Express Padded Flat Rate Envelope offers fast and reliable shipping, with a service that's much faster than Priority Mail.
Any items you can send using the Priority Mail Express Padded Envelope are the same as the Priority Mail Padded Flat Mail.
Express Legal

The Express Legal option is a great choice for sending legal-sized documents quickly and efficiently. You can use the Priority Mail Express Legal Flat Rate Envelope for this purpose.
This envelope offers the same features as the Priority Mail Legal Flat Rate Envelope, but with the added benefits of Priority Mail Express service. The Priority Mail Express Legal Flat Rate Envelope is specifically designed for sending legal-sized documents in the shortest possible time.
The dimensional measurements of the Priority Mail Legal Flat Rate Envelope are 15″ in length and 9-1/2″ in height.
Package vs Services
USPS Priority Mail Package vs Services is a crucial consideration for senders.
The standard option for sending parcels under 70 lbs and 108″ in combined length and girth is USPS Priority Mail.
For lighter parcels, it's usually less expensive to use your own packaging and get a rate.
USPS Priority Flat Rate Services is an alternative to standard Priority Mail.
Flat rate boxes don't have weight, dimensions, or delivery zone factored into their prices.
Standard Priority Mail parcels, on the other hand, have their prices structured around weight, dimensions, and delivery zone.
Comparing Services
The USPS Priority Mail Flat Rate Envelope is a convenient option for sending packages, but it's not the only choice.
The USPS offers a range of services with varying levels of speed and cost, including First Class Package Service and Priority Mail.
One notable difference between the USPS Priority Mail Flat Rate Envelope and other services is the price. The flat rate service costs $7.95 to send anywhere in the US, regardless of weight or destination.
The cost of other services varies depending on the weight and destination of the package, making it harder to predict the final cost.
The USPS Priority Mail Flat Rate Envelope is a good option for sending lightweight packages, weighing up to 1 lb.
The weight limit for other services is also limited, but it varies by service and destination.
The USPS Priority Mail Flat Rate Envelope is a cost-effective option for sending packages to Alaska and Hawaii, with a flat rate of $13.95.
Other services may charge more for shipping to these destinations due to their remote locations.
Shipping Details
The USPS Priority Mail Flat Rate Envelope is a convenient and cost-effective way to send packages, with a flat rate of $8.50 for domestic shipping.
The envelope is available in two sizes, 6.5 x 11.5 inches and 9.5 x 12.5 inches.
Domestic delivery typically takes 2-3 business days, making it a great option for last-minute gifts or urgent packages.
What Is Shipping?
Shipping is a vital part of the e-commerce process, and understanding how it works can save you time and money.
Flat rate shipping is a postal service that offers customers a fixed shipping rate regardless of the package's weight, size, or domestic shipping distance. This makes budgeting for shipping costs straightforward and predictable.
The concept of flat rate shipping is simple: if it fits, it ships for one low rate. This is highly beneficial for businesses managing large volumes of shipments.
USPS Priority Mail Flat Rate service allows you to ship packages anywhere in the U.S. for a flat fee, regardless of the weight (up to 70 lbs) or destination.
Window

The Priority Mail Window Flat Rate Envelope is a convenient option for sending pre-addressed documents or large pre-addressed envelopes.
It allows you to place pre-addressed documents or large pre-addressed envelopes inside it for easy mailing.
You can print mailing labels to ensure easy insertion of your mail.
The Priority Mail Window Flat Rate Envelope is specifically designed by USPS for sending pre-addressed documents and envelopes.
It's perfect for sending business communications, and you can use it to send multiple items at once.
The dimensional measurements of Priority Mail Window Flat Rate Envelopes are available, but unfortunately not mentioned in the provided text.
What Is Email?
The U.S. Postal Service (USPS) provides a 1 to 3 day shipping service called Priority Mail Flat Rate.
This service features one flat rate for delivery of a package or envelope to its destination.
The maximum weight of each envelope or package is up to 70 lbs.
Free shipping supplies are available at the Post Office or sent directly to your residence or business for no charge.
Pricing is determined by the box or envelope you choose, not by the weight or distance the package is traveling.
5. Legal

The Legal Priority Mail Flat Rate Envelope is ideal for sending legal-size documents. It's perfect for healthcare organizations like hospitals, which often send medical collection letters to patients.
The dimensional measurements of the Priority Mail Legal Flat Rate Envelope are 15″ in length and 9-1/2″ in height.
You can use this envelope for sending non-legal documents that are the same size as legal documents. However, it's worth noting that there are other options for sending regular mail.
The Priority Mail Legal Flat Rate Envelope doesn't offer any added advantages over other mail options. It's simply a convenient way to send legal-size documents quickly and efficiently.
Frequently Asked Questions
Is USPS discontinuing flat rate envelopes?
Yes, USPS is discontinuing the Priority Mail Pre-Paid Flat Rate Stamped Envelope, but the Priority Mail Flat Rate Stamped Envelope will still be available online until January 2022.
Can I use my own envelope for priority Mail flat rate?
You can use your own envelope for Priority Mail flat rate, but it must be clearly marked as "Priority Mail." Using USPS-provided packaging is recommended for Priority Mail services.
What size is a priority padded flat rate envelope?
A Priority Mail Padded Flat Rate Envelope measures 12½ inches by 9½ inches when the flap is closed. It's a padded envelope designed for extra protection.
Sources
- https://www.postgrid.com/priority-mail-flat-rate-envelope/
- https://www.shipstation.com/blog/what-is-usps-flat-rate-and-when-should-i-use-it/
- https://www.stamps.com/usps/priority-mail-flat-rate/
- https://phasev.com/blog/quick-guide-to-usps-flat-rate-shipping-priority-mail-options/
- https://qwintry.global/posts/usps-flat-rate-work
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