What happens if a package exceeds the dimensional weight in priority mail?

When a package exceeds the dimensional weight in Priority Mail, it may incur additional charges. Dimensional weight is a pricing technique that considers the size of a package in relation to its weight. This means that if a package is large but lightweight, it may still be subject to a higher shipping cost based on its dimensions. Therefore, when a package fails to meet the dimensional weight requirements, the shipping cost can increase to cover the additional space the package occupies in transportation.

In this scenario, other options such as sending the package back, automatically upgrading it to express, or delivering it without tracking do not align with USPS's handling of dimensional weight matters. Instead, incurring additional charges is the relevant outcome that reflects the adjustments in pricing based on the size and weight of the package.