Suitable for the SodaStream Soda Crystal () I geklauft me Reserve Pack. Who does not know: One has a soda siphon, and when does the CO2 cylinder is empty? Exactly, on Sunday, if you have the house full of guests, and the shops are all closed. Since it is advisable to have a spare bottle in the cupboard. And the extra glass bottle is a little bonus, I like to take. The design of the glass carafe I find very nice =)