Twin pack of extra carbonating bottles and caps for all Drinkmate machines Stock up on extra bottles to make and store different drinks Made from durable food grade PET plastic, BPA-free. Hand wash only. Can replace thousands of disposable bottles and cans May be re-used for carbonation until the expiration date printed on the bottle Drinkmate 0.5 Liter bottles let you easily make a single serving of a carbonated drink. Featuring a quarter turn, quick-connect design for simple, secure sealing. Bottom cap is removable for more thorough cleaning. These long-life bottles will last up to 2 years depending on amount of use, then you can keep using it as a water bottle but not for carbonation. Stock up on different sizes and colors of bottles for maximum flexibility in use. Hand-wash only.