Modified on: Fri, 5 May, 2017 at 1:03 PM
International carriers (like DHL, USPS, UPS, etc.) calculate their shipping rates based on either actual weight or Dimensional/Volumetric Weight. Dimensional/Volumetric Weight (DIM weight) takes a package's size into account.
Imagine you ordered a really large poster. The poster weighs 1 pound, but it only fits in a 20x20x20 box. In this case, carriers will charge you for the size of the box, (20x20x20) and not its weight.
If you think your items could fit into a smaller box, you can always request a repack through the website.