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Airlines charge for space, not just weight. A big box of pillows costs as much to fly as a small heavy box, so we bill whichever is greater:
- Actual weight — what the package weighs on the scale.
- Volumetric weight — what the package's size works out to.
The greater of the two is your billable weight, and that's what your shipping charge is based on.
If the volumetric weight is the higher one, the box is carrying a lot of air — repacking it may bring the billable weight down. See What does Resize do?
