Liquid Filling 2. Types of Filling Machines ⚫ The containers may be made of plastic, metal, glass, treated paperboard, or a number of other materials. ⚫ The shapes of the containers include those of bottles, jars, vials, tubes, cans, pouches, cartons, and drums (Figure 20.1).Liquid Filling 2. Types of Filling Machines ⚫ The containers may be made of plastic, metal, glass, treated paperboard, or a number of other materials. ⚫ The shapes of the containers include those of bottles, jars, vials, tubes, cans, pouches, cartons, and drums (Figure 20.1)