Shipping Box Size Guide: Choose the Right Box
Selecting the right box size saves money and protects items. Use our guide to find the perfect fit.
How do I choose the right shipping box size?
Choose a box with 2 inches of cushioning space around your item. Standard sizes: Small (8x6x4"), Medium (12x10x6"), Large (18x14x8"). Too small risks damage; too large increases dimensional weight costs.
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| Carrier | Service | Price | Delivery Time | |
|---|---|---|---|---|
| USPS | Small Box Shipping (8x6x4", 2 lbs) | $6.50 | 2-5 days | Cheapest |
| USPS | Medium Box Shipping (12x10x6", 3 lbs) | $9.75 | 2-5 days | |
| UPS | Large Box Shipping (18x14x8", 5 lbs) | $14.50 | 1-5 days | |
| USPS | Priority Mail (Free Box Included) | $8.50 | 1-3 days |
Small Box Shipping (8x6x4", 2 lbs)
Medium Box Shipping (12x10x6", 3 lbs)
Large Box Shipping (18x14x8", 5 lbs)
Priority Mail (Free Box Included)
* Prices shown are discounted ShipWave rates. Actual rates vary by exact dimensions, weight, and origin/destination.
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Standard Shipping Box Sizes
Common dimensions (L x W x H):
- Extra Small: 6x4x3" - Jewelry, accessories
- Small: 8x6x4" - Books, small gadgets
- Medium: 12x10x6" - Clothing, shoes, electronics
- Large: 18x14x8" - Multiple items, bulky products
The "right" size has 2 inches of space on each side for cushioning.
Why Box Size Affects Shipping Cost
Dimensional weight: Carriers charge by size OR weight—whichever is greater. An oversized box can cost 2-3x more.
Solution: Use the smallest box that fits with proper cushioning.
Pro Tips to Save More
Add 2 Inches Per Side
Measure your item, then add 2" for cushioning material.
Buy in Bulk
Bulk boxes (100+) cost 40-60% less than singles.
Use Free USPS Boxes
Priority Mail boxes are free at usps.com.
Frequently Asked Questions
- Single items: 12x10x4" or poly mailer. Multiple items: 14x12x6" or larger.
- Yes, if structurally sound. Remove old labels completely.
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Related Shipping Guides
Dimensional weight (DIM) can make light packages expensive. Learn the formula and strategies.
Shipping Supplies: Complete Packing GuideThe right shipping supplies protect your products and can reduce costs. Learn what you need.
USPS Box Sizes: Free Priority Mail & Flat RateUSPS offers free boxes for Priority Mail and Flat Rate shipping. Know your options to maximize savings.
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