A parcel that is rectangular on all sides becomes categorized as an irregular parcel if its weight is less than what?

A rectangular parcel is classified as an irregular parcel based on its weight being less than 6 ounces. This distinction is vital for understanding how shipping rates and handling procedures are determined. For lighter packages that fall under this weight threshold, different regulations and pricing may apply, making it essential for businesses and individuals to accurately categorize parcels to avoid additional charges or handling issues. Keeping track of these criteria ensures compliance with postal regulations and optimizes shipping practices. By recognizing that parcels under this weight limit are deemed irregular, shippers can make informed decisions regarding packaging, shipping methods, and associated costs.