Shipping Box Sizes: Complete Guide
Choosing the right box size affects shipping cost and product safety. Understand standard sizes.
What are standard shipping box sizes?
Common sizes: Small (8x6x4"), Medium (12x10x6"), Large (16x12x8"), Extra Large (20x16x12"). USPS Flat Rate: Small (8.69x5.44x1.75"), Medium (11x8.5x5.5"), Large (12x12x5.5"). Choose 1-2" larger than contents for padding.
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| Carrier | Service | Price | Delivery Time | |
|---|---|---|---|---|
| Size | Small (8x6x4") | $0.50-1.50 | Up to 5 lbs | |
| Size | Medium (12x10x6") | $1.00-2.50 | Up to 15 lbs | |
| USPS | Large Flat Rate Box | Free + $21.60 | Any weight |
Small (8x6x4")
Medium (12x10x6")
Large Flat Rate Box
* Prices shown are discounted ShipWave rates. Actual rates vary by exact dimensions, weight, and origin/destination.
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Standard Box Dimensions
Small (under 10"): 6x4x4", 8x6x4", 10x8x6" - for small items, books.
Medium (10-16"): 12x10x6", 14x10x8" - most common e-commerce size.
Large (16-24"): 18x14x10", 20x16x12" - for larger items.
Pro Tips to Save More
Free USPS Boxes
Priority Mail and Flat Rate boxes are free from USPS.com. Order in bulk.
Frequently Asked Questions
- Yes, through dimensional weight. UPS/FedEx charge by DIM weight when it exceeds actual weight.
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Related Shipping Guides
Dimensional weight (DIM) can make light packages expensive. Learn the formula and strategies.
Cheapest Shipping Option: Complete GuideFinding the lowest shipping rate requires comparing all options. We break down the cheapest carrier for every situation.
Poly Mailer Sizes: Complete GuidePoly mailers are lighter and cheaper than boxes for many items. Find the right size for your products.
FedEx Box Sizes: Complete Packaging GuideFedEx offers free packaging for Express shipments and One Rate simplified pricing. Know your options to optimize shipping costs and delivery speed.
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