
How much are flat rate shipping boxes? Shipping costs can be a major consideration for businesses and individuals alike. Whether you’re an e-commerce seller, a small business owner, or someone sending gifts to family and friends, understanding shipping rates is essential. One of the most convenient and predictable shipping options available is flat-rate shipping boxes. But how much do these boxes actually cost? Let’s dive into the details of how much are Flat Rate shipping boxes, explore the available options, and determine whether they are the best choice for your shipping needs.
What Are Flat Rate Shipping Boxes?
Flat rate shipping boxes are provided by major carriers like the United States Postal Service (USPS), UPS, and FedEx. These boxes allow you to send packages at a fixed rate regardless of weight (up to a specific limit) or distance. How much are flat rate shipping boxes? This simplifies shipping costs, making it easier to budget and plan for shipments.
Benefits of Flat Rate Shipping
- Predictable Pricing: No surprises in cost based on weight or distance.
- Free Boxes: Carriers typically provide the boxes for free, reducing packaging costs.
- Fast Delivery: Flat rate shipping often comes with priority shipping options.
- No Need for Weighing: As long as items fit within the box and meet weight limits, the price remains the same.
How Much Are Flat Rate Shipping Boxes? Step-by-Step Guide
USPS Flat Rate Shipping Costs
The USPS Priority Mail Flat Rate service is one of the most popular shipping options in the U.S. Here’s a breakdown of the pricing as of 2024:
USPS Priority Mail Flat Rate Box Prices
- Small Flat Rate Box
- Price: $10.20
- Dimensions: 8 5/8” x 5 3/8” x 1 5/8”
- Weight Limit: 70 lbs
- Medium Flat Rate Box (Two options: Top-loading & Side-loading)
- Price: $17.10
- Dimensions: 11 1/4” x 8 3/4” x 6” (Top-loading) / 14” x 12” x 3 1/2” (Side-loading)
- Weight Limit: 70 lbs
- Large Flat Rate Box
- Price: $22.80
- Dimensions: 12 1/4” x 12 1/4” x 6”
- Weight Limit: 70 lbs
- APO/FPO/DPO Large Flat Rate Box (For military and diplomatic addresses)
- Price: $21.50
- Dimensions: 12 1/4” x 12 1/4” x 6”
- Weight Limit: 70 lbs
- Padded Flat Rate Envelope
- Price: $10.40
- Dimensions: 9 1/2” x 12 1/2”
- Weight Limit: 70 lbs
- Legal Flat Rate Envelope
- Price: $9.95
- Dimensions: 9 1/2” x 15”
- Weight Limit: 70 lbs
USPS Flat Rate Shipping Speed
USPS Priority Mail Flat Rate boxes typically deliver within 1-3 business days, making them a fast and reliable option.
UPS Flat Rate Shipping Costs
UPS offers a flat-rate shipping service called “UPS Simple Rate.” Prices vary based on package size and speed.
UPS Simple Rate Prices
- Extra Small Package
- Price: $10.20 – $12.00
- Max Volume: 1 cubic foot
- Small Package
- Price: $12.50 – $14.00
- Max Volume: 2 cubic feet
- Medium Package
- Price: $14.50 – $17.00
- Max Volume: 3 cubic feet
- Large Package
- Price: $19.60 – $24.00
- Max Volume: 4 cubic feet
- Extra Large Package
- Price: $24.30 – $30.00
- Max Volume: 5 cubic feet
UPS Flat Rate Shipping Speed
UPS Simple Rate offers options such as:
- UPS Ground (1-5 business days)
- UPS 2nd Day Air (2 business days)
- UPS Next Day Air Saver (1 business day)
FedEx Flat Rate Shipping Costs
FedEx offers flat rate shipping under their “FedEx One Rate” service.
FedEx One Rate Prices
Prices vary based on box size and shipping speed. Here’s a general overview:
- FedEx Envelope
- Price: $9.50 – $36.00
- Weight Limit: 10 lbs
- FedEx Small Box
- Price: $12.00 – $42.00
- Weight Limit: 50 lbs
- FedEx Medium Box
- Price: $14.50 – $46.00
- Weight Limit: 50 lbs
- FedEx Large Box
- Price: $20.00 – $54.00
- Weight Limit: 50 lbs
- FedEx Extra Large Box
- Price: $32.00 – $70.00
- Weight Limit: 50 lbs
FedEx Flat Rate Shipping Speed
FedEx One Rate is available with:
- FedEx Express Saver (3 business days)
- FedEx 2Day (2 business days)
- FedEx Standard Overnight (Next business day)
Which Flat Rate Option Is Best?
The best flat-rate shipping option depends on your needs. Here are some key takeaways:
- Best for Small, Heavy Packages: USPS Priority Mail Flat Rate offers the best value if your package is heavy but small.
- Best for Larger Packages: UPS Simple Rate offers better flexibility in package sizes.
- Best for Speed: FedEx One Rate provides faster shipping options but at a higher cost.
- Best for Free Packaging: USPS provides free boxes, reducing costs.
Final Thoughts
How much are flat rate shipping boxes? Flat rate shipping boxes offer convenience and predictability when shipping packages. The best carrier depends on your shipping needs, whether you prioritize cost, speed, or flexibility. Always compare rates and consider your package’s weight and dimensions before choosing the right option. By understanding these costs, you can make informed shipping decisions that save you money and ensure timely deliveries.

Hello, I am an E-commerce Expert with extensive experience providing services to numerous e-commerce brands and individuals since 2017. My primary areas of expertise include the Amazon, Walmart, and Shopify marketplaces. Linkedin