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Inner Dimensions vs. Outer Dimensions: What's the Difference?
Inner Dimensions vs. Outer Dimensions: What's the Difference?

Learn why entering your package's inner dimensions may lead to carrier adjustments from USPS® and UPS®

Updated over a week ago
  • Check Your Box's Dimensions: Sometimes when you order packaging from box manufacturers, the dimensions listed on the outside don't reflect the dimensions you need to enter in Pirate Ship to purchase accurate postage 🙈 In some cases, the dimensions listed on a package reflect its inner dimensions, not the outer dimensions.

  • Use Outer Dimensions to Make Labels in Pirate Ship: To purchase accurate postage on Pirate Ship, you need to enter your box's outer dimensions, and not the inner dimensions. Before you ship, we suggest double-checking your package to ensure the dimensions listed on it are accurate.

The Difference Between Inner & Outer Dimensions

  • Inner Dimensions vs. Outer Dimensions: Inner dimensions refer to the dimensions on the inside of your box, while outer dimensions refer to the dimensions on the outside.

    • For some boxes, the difference between inner and outer dimensions can be up to half an inch for each measurement, which can cause the price of your postage to change 😅

Always use outer dimensions when entering your package info in Pirate Ship

  • Outer Dimensions Only: Whenever you make labels on Pirate Ship, be sure to always enter your package's outer dimensions. USPS and UPS both have automated systems to verify that your package details align with what you entered when you made your label, and outer dimensions are one of the items they verify (along with weight, and the type of packaging you use).

Inputting the inner dimensions could lead to carrier adjustments

  • Using Inner Dimensions May Cause Carrier Adjustments: If you enter your package's inner dimensions instead of its outer dimensions, you could face carrier adjustments in the form of APV charges from USPS and surcharges from UPS.

    • When you enter your package's inner dimensions instead of its outer dimensions, USPS and UPS may deem your label inaccurate for your packaging, and they will charge your Pirate Ship account for the difference in the postage.

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