Usps Flat Rate Boxes: All You Need to Know

Usps Flat Rate Boxes: USPS quotes, “We help businesses provide these services and resources to your customers at discounted rates.” Keeping this in mind, we are introduced to the USPS Flat Rate Boxes. 

It’s quite unfortunate that several merchants in The US underuse USPS Flat Rate Boxes. It is because they do not understand the available options and opportunities related to it. Perhaps it is the easiest, most efficient, yet cost-effective shipping method to deliver a parcel. This article intends to clear all the doubts related to Flat Rate Boxes.

Whether it’s about their price or the parcel size, we are here to discuss all the details about USPS Flat Rate Boxes and help you to make your next shipment a bit easier with it.

What is “USPS Flat Rate Boxes”?

The U.S.Postal Services introduces boxes with flat postal rates for both heavy and lightweight packages. The weight of the parcel is the main factor for most of the online shipping services. However, if you have a heavier shipment to make, USPS flat rate boxes are the best option that you can opt for.


Shipping your product with this particular service will reduce transportation costs by 50%. It is somewhat considered to be the most effective way of shipping for e-Commerce businesses. 

Significant factors that make USPS Flat Rate Boxes best for e-Commerce are as follows:

  1. The entire price and dimension structure for every product is fixed. 
  2. The Priority Flat Rate Shipping also offers some special considerations during a delivery.
  3. The shipping process will not charge you any shipment costs.
  4. You can drop the items at any nearby USPS Store.
  5. Every package is insured up to $50.
  6. USPS websites also offer effective tracking facilities for the parcels for your convenience

What is “Priority Mail Flat Rate”?

Priority Mail Flat Rate is a 1-3 days shipping service provided all across the US. It is a Free Shipping Supply that sends your parcel directly to the customer for no extra charge at all. This service permits parcels that weigh less than 70lbs. There are various options for packaging (discussed below) from where you can choose your suitable ones.

How to Send Packages with USPS Priority Mail Flat Rate Boxes?

Are you planning to make your shipment through USPS Priority Mail Flat Rate Boxes? Follow these 5 easy steps, and you will know how to ship with this service.

● Order for flat rate boxes online from USPS

● Next, make sure to determine the dimension of the product and choose a box size accordingly. Prices may vary depending on the size you choose. Hence, it is important to get the proper size of the box. Keep in mind that you are not allowed to make a shipment for a product that weighs more than 70lbs

● Collect it from your local post office and pack the items into the box

● Properly label the address where it would be sent. Make sure the labeling you are using matches the package.

● Once finished labeling, send the box for shipment.

Flat Rate Dimensions and Prices in 2020

The rate basically depends on both the size and dimension of the product. You can send a parcel that can weigh up to 70lbs, and the maximum combined length and girth will be 108 degrees. The price starts at $7.50, and it gradually varies with the product size and dimensions. Let’s have a look at the dimension, price, and what particular product type it actually suits.

Flat Rate  Envelope$7.55 for Commercial Base, $7.75  for Post Office and Online.12½” X 9½”●      Letters●      Documents
Gift Card Flat Rate Envelope$7.55 for Commercial Base, $7.75  for Post Office and Online10” X 7”●      Big Greetings Card●      Gift Cards
Window Flat Rate Envelope$7.55 for Commercial Base, $7.75  for Post Office and Online10” X 5”12½” X  9½”●      Pre Addressed Envelopes
Small Flat Rate Envelope$7.55 for Commercial Base, $7.75  for Post Office and Online10” X 6” ●      Passports●      Some Small Documents
Padded Flat Rate Envelope$8.15 for Commercial Base, $8.40  for Post Office and Online12½” X 9½”●      Box Jewellery●      Books●      Clothes
Legal Flat Rate Envelope$7.85 for Commercial Base, $8.05  for Post Office and Online15” X 9½”●      Legal Documents
Small Flat Rate Box$8.05 for Commercial Base, $8.3.0  for Post Office and OnlineOutside dimension: 8 11/16″ x 5 7/16″ x 1 3/4″Inside dimension: 8 5/8″ x 5 3/8″ x 1●      Small Electronic Products●      Brochures
Medium Flat Rate Box 1$13.60 for Commercial Base, $15.05  for Post Office and OnlineOutside dimension: 11 1/4″ x 8 3/4″ x 6″Inside dimension: 11″ x 8 1/2″ x 5 1/2●      Shoes●      Official Products
Medium Flat Rate Box 2$13.60 for Commercial Base, $15.05  for Post Office and OnlineOutside dimension: 14″ x 12″ x 3 1/2″Inside dimension: 13 5/8″ x 11 7/8″ x 3 3/8″●      Shoes●      Official Products
Large Flat Rate Box$18.70 for Commercial Base, $21.10  for Post Office and OnlineOutside dimension: 12 ¼” X 12 ¼” X 6Inside dimension: 12” X 12” X 5 1/2”●      Computer●      Laptops●      Other Gifts
FPO/APO/DPO Flat Rate Box$17.20 for Commercial Base, $19.60  for Post Office and OnlineOutside dimension: 12 ¼” X 12 ¼” X 6Inside dimension: 12” X 12” X 5 1/2”●      Sending Several Gifts
Large Flat Rate Box$18.70 for Commercial Base, $21.10  for Post Office and OnlineOutside dimension: 24 1/16” X 11 ⅞” X 3 ⅛”Inside dimension: 23 11/16” X 11 ¾” X 3●      Board games
Pre-Paid Forever Priority Mail Flat Rate Packaging$7.75  for Post Office and OnlineNumerous Sizes AvailableNumerous Options Available

Does Priority Mail Differ from Flat Rate? 

Technically, both are the parts of priority mail mainstream. That means both consider easy shipment within 1-3 business days. USPS Flat Rate Boxes are the best option for heavy items that travel a longer distance. Priority Mail price starts from $7.35 at both the US Post Office and Online. There are certain restrictions on both services. For instance, any restricted, prohibited, or hazardous materials will not be allowed for shipment. The Prepaid Forever Priority Mail Flat Rate provides the same Flat Rate Pricing with the “Forever Postage” facility.

FAQs on Usps Flat Rate Boxes

Can I mail liquids in flat rate boxes?

Yes, you can mail liquids but always ensure that the container is strong enough to protect any glass containers. Boxes are solid and strong, containing cushions that are appropriate for carrying liquids.

Are USPS flat rate and priority mail the same?

The main purpose of both the services is to deliver large and small items to their destination within a small amount. The cost of both services varies a bit.

Who can use Flat Rate Boxes?

Anyone irrelevant for business or personal use. It is perfect for those sellers who ship heavy yet small packages all across the US.

The Bottom Line:

The best way to cut off your shipping cost is by opting for USPS Flat Rate Boxes. It’s a convenient and easy way to ship your package without having to worry about the weight or shipping charge. Let your e-Commerce package reach its potential client with the help of The US Postal Services Flat Rate Boxes.

Charles Helms
About Author:
Charles Helms is an independent contractor having 15 years of experience in courier services. Charles has worked with all the major shipping companies like DHL, FedEx, and USPS. With a vast knowledge in this particular domain, he is now willing to help others if anyone is having trouble with any shipping companies.
Charles believes, “Knowledge must be shared.” Hence, he created this online platform named Tracking Advice to help people with his informative blogs and news. He has also made up a small team of professionals from the same field to assist several customers online. He plans to expand this platform even further, and he believes that success is inevitable!

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