This sub-class includes courier activities involving the conveyance of express letters and/or parcel items, and general commercial items. Courier activities (other than national post activities) involves the conveyance of express letters or items through networks other than the postal service infrastructure, and/or typically involve value-added services such as door-to-door pick-up and/or delivery of items, item tracking and acknowledgement of receipt of the item. One or more modes of transport may be involved and the activity may be carried out with either self-owned (private) transport or via public transport. Units in this sub-class are primarily engaged in: •pickup, sorting, transport and/or delivery (domestic or international) of letters and/or parcels by firms not utilising the postal service infrastructure •distribution and/or delivery of mail and/or parcels