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Save money on shipping! Experienced merchants know that using USPS Flat Rate boxes can save you money. The problem is that in order to use flat rate boxes, you need to ensure that your products fit within the specified weight and dimensions. By default, this check is not accurately performed when displaying USPS flat rate box shipping methods to customers. The result is that USPS flat rate boxes that might not be able to fit the cart items are often shown as an option to customers, which can cause you to lose money on shipping.
The USPS Flat Rate Box extension* solves this problem by using a high-performance, high-accuracy algorithm to figure out if the products in a given order fit into the various flat rate shipping containers using each product’s dimensions (not their volume). Only those flat rate shipping containers that can actually fit the order will be displayed to the customer.
The solution involves something called "bin packing."
Bin packing is a way of determining how 3-dimensional objects (e.g., your products) fit inside of another 3-dimensional object (e.g., a flat rate box). There is no way of creating a mathematical formula to solve this, and the job must be done by a specialized algorithm.
By using this extension you can be sure that with each order only the "best fit" USPS flat rate shipping container is displayed to your customers, saving money on shipping.

By displaying the correct USPS flat rate box to your customers, you could see immediate savings. The following chart shows how much you could save.

Still not convinced? Check out 7 Reasons to Consider USPS Flat Rate Shipping by Armando Roggio to see why flat rate boxes are often the better choice for online stores.
*A $4.99/mo API subscription is required which includes access to our bin packing API, free extension upgrades, algorithm upgrades, and our world-class support.
This extension was developed by and is supported by Evoksha
The best place to start if you need help with a specific extension is to contact the developer. All Magento developers have both a contact email and a support email listed.
If you need support for a Magento platform, there are different options for support depending on which Magento platform you are using. Below are links for specific platforms.
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