Copacker
A contract packer, or co-packer, is a company that manufactures and packages foods or other products for their clients. To market and distribute, a copacker works under contract with the hiring company to manufacture food as though the products were manufactured directly by the hiring company.
A co-packer is similar to a contract manufacturer in other industries, such as automotive or aerospace. Co-packing is commonly used when the producing company doesn't have the packing capacity, machinery, knowledge etc.