Ever stared at a pile of things you need to mail and wondered, “How much will it actually cost to send all this?” If you’ve considered using a USPS Flat Rate box—the famous “if it fits, it ships” boxes—you’re not alone.
Understanding how USPS determines these shipping prices can save you time, money, and frustration. This article breaks it all down: what the “if it fits, it ships” slogan really means, the current box prices, tips for choosing the right one, and how to get the best deal every time you ship.
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Understanding How USPS “If It Fits, It Ships” Box Prices Work
USPS’s popular “If It Fits, It Ships” offering refers to their Priority Mail Flat Rate boxes. The concept is simple: as long as your items fit inside one of their approved flat-rate boxes and the box closes completely, you pay a single predetermined rate, regardless of how much it weighs (up to 70 pounds) or how far it travels within the U.S.
This service is especially useful for individuals and businesses looking to ship small, heavy items or when shipping across long distances, as rates do not increase by weight or destination. Let’s break down how it works, the options available, and tips for making the most of it.
What are USPS Flat Rate Boxes?
Flat Rate Boxes are sturdy corrugated cardboard boxes offered by USPS through their Priority Mail service. You pay a set fee based on the size of the box rather than the package’s weight or the shipping distance.
Why Choose Flat Rate Shipping?
- Simplicity: One price, regardless of destination or weight.
- Predictability: Know your shipping costs upfront.
- Speed: Packages typically arrive within 1-3 business days.
- Convenience: Boxes are available for free at most post offices and online.
Types and Sizes of USPS Flat Rate Boxes
USPS offers several types and sizes of Flat Rate packaging. Here’s a quick guide:
Flat Rate Envelopes
Best for documents, legal papers, or thin, compact items.
- Flat Rate Envelope: 12.5″ x 9.5″
- Legal Flat Rate Envelope: 15″ x 9.5″
- Padded Flat Rate Envelope: 12.5″ x 9.5″ (with padding for extra protection)
Flat Rate Boxes
Made to accommodate different shapes and volumes:
- Small Flat Rate Box
- Size: 8-5/8″ x 5-3/8″ x 1-5/8″
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Ideal for small electronics, jewelry, or small accessories.
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Medium Flat Rate Box
- Two variations for flexible packing:
– Top Loading: 11-1/4″ x 8-3/4″ x 6″
– Side Loading: 14″ x 12″ x 3-1/2″ -
Good for shoes, books, or multiple smaller items.
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Large Flat Rate Box
- Size: 12-1/4″ x 12-1/4″ x 6″
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Great for larger, heavier items or shipping to military addresses (APO/FPO/DPO).
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APO/FPO Large Flat Rate Box
- Specially designated for military addresses abroad, often at a reduced price.
How USPS Flat Rate Pricing Works
The flat rate system is straightforward:
- Select the correct size box for your items.
- Pack your goods, ensuring everything fits and the box can close securely.
- Pay the flat rate, regardless of weight (up to 70 lbs.) and distance.
- Drop off at a post office or schedule a pickup.
Examples of Flat Rate Pricing (as of 2024)
- Flat Rate Envelope: Around $9.95
- Small Flat Rate Box: Around $10.20
- Medium Flat Rate Box: Around $17.10
- Large Flat Rate Box: Around $22.80
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APO/FPO Large Box: Lower pricing, around $21.20
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Note: Prices are approximate and may vary based on current rates or commercial discounts.*
Benefits of USPS “If It Fits, It Ships” Flat Rate Boxes
1. Cost Savings
Flat Rate boxes are especially cost-effective when you need to ship:
- Heavy items (the closer to 70 lbs., the better your value)
- Items traveling long distances (coast-to-coast or to US territories)
- Items being shipped to military addresses
2. Free Packaging
- Flat Rate envelopes and boxes are free from USPS. You can order them online or pick them up at a post office.
3. Insurance and Tracking Included
- Each Priority Mail Flat Rate box includes $100 of insurance and free tracking.
4. Fast Delivery
- Most arrive within 1-3 business days across the United States.
When to Use Flat Rate Boxes (And When Not To)
Good Scenarios
- Shipping Heavy Items: Books, tools, metal objects, etc.
- Long Distance Shipments: When buying or selling online to remote locations.
- Shipping to Military Addresses: Special rates for APO/FPO/DPO.
Not Ideal Scenarios
- Lightweight Shipments: If your package is light and going a short distance, using your own box and paying by weight/zone may be cheaper.
- Bulky or Oversized Items: If your item doesn’t fit or risks damaging the box, flat rate is not suitable.
Rules & Guidelines for “If It Fits, It Ships”
- Box Must Close Properly: It must close using normal folds and not be modified or overstuffed.
- Maximum Weight: 70 lbs.—exceeding this can result in surcharges or package refusal.
- No Alterations: Do not change the box’s size or shape.
- Delivery in U.S.: Flat Rate prices are for domestic shipments, but there are options for U.S. territories and military mail.
How to Use USPS Flat Rate Boxes: Step-by-Step
- Pick the Right Box: Visit your local post office or order online; choose based on your item’s size and shape.
- Pack Carefully: Place your items snugly but don’t force or bulge the box.
- Seal It Up: Use strong packing tape, sealing all seams.
- Label the Box: Write the address legibly or use pre-printed shipping labels.
- Purchase Postage: Buy at the post office, online, or use a postage machine.
- Ship: Drop off at any USPS location or schedule a free pickup.
Practical Tips for Saving Money and Shipping Smart
- Compare Rates: For lighter packages, compare regional or first-class rates—they might be less expensive.
- Bulk Shipping: Use medium or large boxes for multiple items, optimizing space and cost.
- Use Online Postage Tools: Online tools often offer discounts, and you can print labels at home.
- Prepare for Holidays: Boxes can run out during peak shipping times—order early.
- Know Restrictions: Some items (hazardous materials, liquids, etc.) have shipping limitations—check before mailing.
Common Challenges & How to Overcome Them
Overpacking
It can be tempting to stuff the box, but forcing it closed can cause damage and postal issues. Pack securely but not excessively.
Dimensional Problems
If items nearly fit, but the box bulges, consider moving down a size or splitting into two packages.
Shipping Fragile Items
Wrap breakables in bubble wrap and cushion with packing peanuts to prevent internal movement.
Cost Surprise
For local shipping of light items, you may pay less by not using a Flat Rate option—check before committing.
Best Practices for Flat Rate Shipping Success
- Order Supplies Early: USPS will ship flat rate boxes to you for free—keep some on hand for convenience.
- Print Shipping Labels Online: Save a trip and sometimes a few dollars by printing at home.
- Check for Corporate Rates: Businesses and frequent shippers can access discounts or commercial base pricing.
- Understand Holiday Schedules: Plan ahead for busier months to ensure timely delivery.
- Keep Receipts and Tracking Numbers: For peace of mind and proof of shipment.
Summary
USPS’s “If It Fits, It Ships” Flat Rate boxes offer a simple, cost-effective, and reliable way to mail packages across the U.S. You pay a single rate based on box size, no matter the distance or weight (up to 70 lbs.). It’s especially great for shipping heavy items, long distances, or to military addresses. Understanding the types of boxes, pricing, rules, and best practices helps ensure you get the best value for your shipping dollar.
Frequently Asked Questions (FAQs)
What is included with USPS Flat Rate shipping?
Every Priority Mail Flat Rate shipment includes free packaging, tracking, and up to $100 in insurance coverage.
How much can I put in a Flat Rate box?
You can fill the box with as much as you can fit, as long as the box closes using its normal folds and the total weight doesn’t exceed 70 pounds.
Are Flat Rate boxes faster than regular mail?
Yes. Priority Mail Flat Rate boxes generally deliver within 1 to 3 business days, which is faster than standard or first-class mail.
Is Flat Rate always the cheapest shipping option?
Not always. For light packages going short distances, traditional weight- and zone-based pricing may be less expensive. Flat Rate is typically best for heavier or long-distance shipments.
Can I use Flat Rate boxes for international shipping?
Some Flat Rate boxes and envelopes are eligible for international shipping at separate, fixed international rates. Be sure to check with USPS for available international Flat Rate options.
With these tips and insights, you’re now ready to pack, label, and ship smartly using USPS’s “If It Fits, It Ships” Flat Rate boxes!
