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The key feature of a Priority Mail package that may incur an additional charge is the balloon surcharge for length plus girth. This surcharge applies to packages that exceed a certain size, specifically when the combined length and girth (the distance around the thickest part of the package) is more than a designated measurement. This is significant because it accounts for the increased handling and shipping costs associated with larger packages, which may not fit into standard shipping procedures or equipment.

Understanding the concept of balloon pricing is crucial in the context of shipping because dimensions can greatly affect the cost. In the shipping industry, larger packages may require additional space during transport and may occupy capacity that could otherwise be used for smaller, more efficient shipments. This creates a need for specialized pricing structures, which is what the balloon surcharge addresses.

This aspect of shipping is particularly relevant for those preparing shipments through Priority Mail, as it encourages shippers to consider the dimensions of their packages seriously in order to avoid unexpected costs. Recognizing these details can help customers manage their shipping expenses more effectively.