A Vial is a small glass or plastic bottle especially designed to contain medicines in liquid or powdered form, or in other forms like capsules. Generally, vials are made of glass particularly pyrex. But plastic vials have slowly replaced glass vials, though not completely, in the last few years. Vials made of different grades of plastic are manufactured on large-scale nowadays. Plastics vials are cheaper and less expensive than glass vials. It is also less fragile than those made of glass. For both glass plastic vials, there are different types of closure systems, for example, screw vials, lip vials, and crimp vials. A plastic vial comes in a tubular shape or a bottle-like shape with a narrow neck. Though relatively small, unlike the regular bottles, vials can also be found in a variety of sizes. Small bottle-shaped vials used in laboratories are called bijou or McCartney's bottles.