What does it mean if a parcel is termed 'non-machinable'?

A parcel described as 'non-machinable' means that it does not meet the criteria necessary for processing by automated machinery. Mail carriers use specialized machines to sort and process various types of parcels with speed and efficiency. If a parcel is too irregular in shape, too large, or has an insufficiently rigid structure, it won't fit the machines' requirements, leading to it being classified as non-machinable. This processing classification typically results in additional handling requirements and potentially higher shipping costs, as the parcel must be processed manually instead.

The other choices do not accurately reflect the definition of non-machinable. For instance, being suitable for only international shipping or local delivery doesn't relate to the machine processing capabilities of the parcel. Likewise, weight alone does not inherently categorize a parcel as non-machinable, as items can be lightweight but still designed for machine processing.