USPS Postal Support Employee (PSE) Practice Exam

The correct choice highlights that irregular parcels are designated for items that do not fit the standard shape or size for regular mail but are often heavier and bulkier, such as books and appliances. This category can include items that are too large, have unusual shapes, or are made of materials that make them unsuitable for normal processing methods.

Irregular parcels are specifically categorized to ensure they receive appropriate handling during the shipping process due to their weight and potential for damage if improperly sorted with standard mail. This further implies that they may require special consideration in terms of packaging and postage.

In contrast, the other categories refer more to items that are either of a normal-sized nature or yet do not have the heavy weight characteristic of irregular parcels. Understanding this classification helps ensure that items such as books and appliances are processed efficiently and correctly within the postal system.