What is the charge when a balloon surcharge applies?

The appropriate charge when a balloon surcharge applies is based on the dimensional weight of the package rather than just its actual weight. A balloon surcharge is applied when the dimensional weight of a package exceeds its actual weight, indicating that the package is larger but not necessarily heavier. The 20 lb rate refers to the pricing structure used for packages that may be classified under this category, particularly for shipments that fall within the dimensional weight guidelines set by USPS.

Selecting the 20 lb rate recognizes that this is a common weight category where dimensional weight pricing is particularly relevant. If a package's dimensions imply a greater weight for shipping calculations (essentially treating it as if it weighs 20 pounds for pricing), this option reflects the surcharge effectively. Understanding this system is crucial for cost estimation in shipping, ensuring that customers are aware of potential additional charges based on size rather than just weight.