The two-liter bottle is a common container for , beer, and wine. These bottles are produced from polyethylene terephthalate, also known as PET plastic, or glass using the blow molding process. Bottle labels consist of a printed, tight-fitted plastic sleeve. A resealable screw-top allows the contents to be used at various times while retaining carbonation.
In the United States, the two-liter bottle is one of the few cases where a product is sold by a round number of metric system. Since very few other beverages are sold in this exact quantity, the term "two-liter" in American English almost invariably refers to a soft drink bottle. Other common metric sizes for plastic soft drink bottles include 500 milliliters, 1 liter, and 3 liters.
Most modern-day two-liter bottles are one piece of PET (polyethylene terephthalate) with a base that is molded with a radial to provide strength for the bottom and the ability to stand upright. Most early two-liters had a separate opaque base glued to the hemispherical bottom of the clear PET flask. This base had a coaxial corrugation and drain holes.
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