What type of parcel must weigh at least 6 ounces, but not more than 25 pounds?

The correct answer indicates that the type of parcel classified as machinable must weigh at least 6 ounces but not more than 25 pounds. Machinable parcels are those that can easily pass through processing machinery due to their dimensions and weight. This classification ensures that packages meet specific criteria to facilitate efficient handling and processing within postal services.

In contrast to standard parcels, which may have more varied weight and size requirements, or express parcels that prioritize speed and may have different weight limits, machinable items specifically cater to a range that aligns with typical operational capacities of machines used in sorting and handling. Understanding these classifications helps ensure that shipments are processed smoothly and effectively within the postal system.