SodaStream 1748220010 5L Slim Black Carbonating Bottles Twin Pack.5-Liter Extra carbonating bottles for SodaStream Sparkling Water Makers. Hermetically sealing cap keeps sparkling water fresh longer than competitive carbonated beverages Better than recycling; each multi use bottles saves up to 550 plastic bottles a year Hand wash Only Compatible with all sparkling water makers except Penguin, Crystal, Genesis and Aqua Fizz