What type of parcel does not meet the minimum dimensions of a machinable parcel?

The type of parcel that does not meet the minimum dimensions of a machinable parcel is indeed irregular. An irregular parcel typically has dimensions or shapes that deviate from standard sizes, which makes it difficult for automated sorting machines to process effectively. Standard machinable parcels are designed to fit within specific dimensional limits that allow them to be efficiently handled by automated systems. This includes parcels that fall within the typical dimensions for flats and standard packages. Heavy parcels, while they can also be outside standard dimensions based on weight, usually still fall within the accepted size categories for machinable items. Therefore, irregular parcels are recognized as those that do not conform to the standardized parameters necessary for machine processing, which leads to them being classified as non-machinable.