What classification is given to parcels weighing 6 ounces or less?

The classification of parcels weighing 6 ounces or less is categorized as "Irregular Parcel." This classification is used when dealing with items that do not conform to the regular shape and size standards set by the USPS for other types of mail and packages. Irregular Parcels typically include items that may be difficult to fit into standard envelope or flat rate options due to their unique shape but still fall within the specific weight limit.

It's important to note that other classifications such as Flat Rate and Priority Mail typically apply to parcels that exceed this weight limit or have specific shipping requirements that do not align with the criteria for Irregular Parcels. Standard Parcel generally encompasses heavier items that do not qualify for the other categories and do not have the same urgent delivery expectations associated with Priority Mail.