Contract packaging or co-packing refers to the packing of products by third-party contract packagers or packaging companies. Melbourne area manufacturers often rely on this service which may involve hand packing, machine packing, labelling and repacking, along with filling, assembly and quality assurance. In some cases, it may involve placing stickers over incorrect or out-of-date information on existing packaging. Outsourcing this work to a packing company, also referred to as co packers, is common in many industries.