a coated paperboard blank is placed in the mold and formed into the desired shape of the container . polymers injection - molded into specific areas about the carton blank to hold the blank together and prevent liquid leaks . polymer is also injection - molded to form a handle providing easy carrying and pouring . a pouring opening can be injection - molded onto the container top . the bottom of the package has an injection - molded lip to receive a container bottom at a later time .