
To ensure accurate shipping with Priority Mail Flat Rate Envelopes, it's essential to know the correct dimensions. The maximum dimensions for a Priority Mail Flat Rate Envelope are 12-1/2 inches long, 11-5/8 inches wide, and 1/4 inch thick.
These dimensions are crucial for avoiding additional postage fees and ensuring your package is processed correctly. You can fit a lot of items in a Priority Mail Flat Rate Envelope, but it's vital to stay within these limits.
A 12-1/2 inch length is a significant amount of space, but it's still a relatively small package. You can fit a large number of small items, such as documents, photos, or small gifts, within these dimensions.
Remember, staying within the maximum dimensions will save you money and ensure your package is delivered efficiently.
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USPS Envelope Options
USPS offers several types of Priority Mail envelopes, including flat rate and variable rate options. Flat rate envelopes cost the same regardless of the weight or destination, while variable rate envelopes prices change based on the weight and destination.
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You can choose from three types of flat rate envelopes: the standard Flat Rate Envelope, the Padded Flat Rate Envelope, and the Legal Flat Rate Envelope. The dimensions of these envelopes are 12 1/2″ x 9 1/2″, 12 1/2″ x 9 1/2″, and 15″ x 9 1/2″ respectively.
Here are the dimensions for each type of flat rate envelope:
Flat rate envelopes are a cost-effective option for shipping items that are heavy or need to be delivered quickly.
Choosing the Right Option
If you're shipping heavy items, a flat rate envelope is ideal for documents and small items up to 70 lbs.
You can choose from various flat rate envelopes, including the Flat Rate Envelope, Legal Flat Rate Envelope, and Padded Flat Rate Envelope.
For lighter packages or short trips, variable rate envelopes are a better option, as the cost depends on weight and distance.
USPS Priority Mail shipping comes in two main types: flat rate and variable rate envelopes, so it's essential to consider your shipping needs before making a decision.

The fixed cost of $9.95 for USPS Flat Rate Envelopes makes it a great choice for heavier items, as the shipping cost is simplified.
Here's a quick comparison of flat rate and variable rate envelopes:
By considering your shipping needs and the characteristics of each option, you can choose the best envelope for your business or personal use.
USPS Boxes Prices
The USPS offers a range of flat rate boxes that can simplify your shipping process.
The commercial base price for a USPS Flat Rate Envelope is $7.40, with the post office and online price being $7.95.
You can choose from a variety of box sizes, including the Small Flat Rate Envelope, which measures 10″ x 6″.
The commercial base price for the USPS Small Flat Rate Box is $7.90, with the post office and online price being $8.45.
The prices for the USPS boxes stay the same, regardless of weight, as long as the weight does not exceed 70 lbs.
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Here's a summary of the USPS flat rate box prices:
With the USPS flat rate boxes, you can offer your customers the option to add more to their order for the same shipping costs, if they still have room in the box.
USPS Envelope Basics
The United States Postal Service (USPS) has many Priority Mail envelope options.
You can choose from flat rate envelopes to variable rate ones.
USPS Priority Mail is both reliable and affordable for your shipping needs.
Flat rate envelopes are a great option for sending small packages and letters.
They offer a fixed price for shipping, regardless of the package's weight or destination.
This can be a big cost-saver for frequent senders.
Variable rate envelopes, on the other hand, have different prices depending on the package's size and weight.
This option is best for packages that are larger or heavier.
It's worth noting that USPS Priority Mail is a popular choice among online sellers and small business owners.
They appreciate the reliability and affordability it offers.
USPS Envelope Sizes
The size of priority mail envelopes varies by type, with the most common being the Flat Rate Envelope, which measures 12 1/2″ x 9 1/2″.
There are also padded and legal flat rate envelopes available, with the padded flat rate envelope also measuring 12 1/2″ x 9 1/2″ and the legal flat rate envelope measuring 15″ x 9 1/2″.
Here's a quick reference guide to the different types of flat rate envelopes:
USPS Envelope Sizes
The USPS offers various envelope sizes for Priority Mail, and understanding these sizes is key to accurate and cost-effective shipping.
The Flat Rate Envelope measures 12 1/2″ x 9 1/2″, making it a great option for packages of this size.
The Padded Flat Rate Envelope is the same size as the regular Flat Rate Envelope, but with added padding for extra protection.
The Legal Flat Rate Envelope measures 15″ x 9 1/2″, making it a good choice for larger documents or packages.
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You can choose from flat rate envelopes to variable rate ones, depending on your shipping needs.
Here are the key dimensions for each envelope type:
The size of your package matters for shipping costs, so make sure to measure it well to pick the right envelope.
USPS
USPS has many Priority Mail envelope options, including flat rate and variable rate ones, which are both reliable and affordable for shipping needs.
You can choose from different envelope sizes to fit your needs, including the Flat Rate Envelope, which is 12 1/2″ x 9 1/2″. The Padded Flat Rate Envelope is also 12 1/2″ x 9 1/2″, but with padding.
The Legal Flat Rate Envelope is 15″ x 9 1/2″, which is a bit larger than the standard Flat Rate Envelope. Knowing the different envelope sizes helps you choose the best shipping option and saves you money.
Here are the dimensions of the different Priority Mail envelopes:
USPS Priority Mail Flat Rate Envelopes are a popular shipping option for sending documents, small items, and other materials. They are made of durable material and are designed to protect the contents during shipping.
The key feature of USPS Priority Mail Flat Rate Envelopes is that they have a flat rate, regardless of the weight or destination of the package. This makes it a cost-effective option for shipping items that are heavy or need to be delivered quickly.
The cost of using USPS Priority Mail Flat Rate Envelopes varies depending on the size of the envelope, but the prices are generally affordable, with the Flat Rate Envelope costing $7.40 to $7.95, depending on whether you buy it online or at a post office.
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USPS Shipping
USPS Shipping is a convenient option for sending documents, small items, and other materials. You can use USPS Priority Mail Flat Rate Envelopes for domestic and international shipping.
These envelopes are made of durable material and are designed to protect the contents during shipping. They come with USPS tracking and insurance up to $50.
You don't need to weigh the package or calculate postage when using Priority Mail Flat Rate Envelopes, as the flat rate applies regardless of weight. This makes it a cost-effective option for shipping items that are heavy or need to be delivered quickly.
Here are the different sizes of Priority Mail Flat Rate Envelopes:
- Priority Mail Flat Rate Envelope: 12 ½” (L) x 9 ½” (W)
- Priority Mail Flat Rate Legal Envelope: 15” (L) x 9 ½” (W)
- Priority Mail Flat Rate Padded Envelope: 9 ½” (L) x 12 ½” (W)
When to Choose Each Option

When shipping items, it's essential to choose the right option to ensure a smooth and cost-effective experience. Flat Rate Envelopes are perfect for heavy items, as they offer a fixed shipping cost of $9.95, regardless of weight or destination.
For heavier items or when you want a fixed shipping cost, no matter the package's contents or where it goes, Flat Rate Envelopes are the way to go. This option is ideal for documents and small items up to 70 lbs.
Variable Rate Envelopes, on the other hand, are better suited for lighter packages or short trips, as the cost depends on weight and distance. They're a great option for packages that don't weigh much or are being shipped short distances.
Here's a quick comparison of the two options:
By considering the weight and destination of your packages, you can make an informed decision and choose the right option for your shipping needs.
USPS International Shipping

USPS Priority Mail International offers a flat rate shipping option for sending packages to over 180 countries, with guaranteed delivery within 6-10 business days.
The flat rate applies regardless of weight or destination, making it a cost-effective option for shipping internationally. This is especially useful for eCommerce businesses that want to offer free shipping to their customers.
With USPS Priority Mail International, you can ship packages using free Flat Rate Boxes and Envelopes, or ship by weight for packages up to 70 lbs.
USPS offers insurance for flat-rate boxes up to $200 for merchandise and products, so you can rest assured that your customers' packages are protected.
Packages may qualify for free Package Pickup from either your office or business, making it easy to get your packages sent out.
Tracking is also included in all international flat-rate packages, so your customers can know exactly where their parcels are at all times right from your website.
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The key feature of USPS Priority Mail International is that it offers a flat rate, regardless of the weight or destination of the package. This makes it a cost-effective option for shipping items that are heavy or need to be delivered quickly.
Here are the benefits of using USPS International Shipping:
- Guaranteed delivery within 6-10 business days
- Flat rate applies regardless of weight or destination
- Insurance up to $200 for merchandise and products
- Free Package Pickup available
- Tracking included
Types of Envelopes
There are two main types of Priority Mail envelopes to choose from.
Flat Rate Envelopes cost the same no matter the weight or where they go in the U.S.
Variable Rate Envelopes, on the other hand, have prices that change based on the weight of your package and its destination.
Both options are available from the United States Postal Service (USPS), giving you flexibility in your shipping needs.
Here are the types of Priority Mail envelopes in a quick reference list:
- Flat Rate Envelopes: cost the same no matter the weight or where they go in the U.S.
- Variable Rate Envelopes: prices change based on how heavy your package is and where it’s going.
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