2x SodaStream Duopack glass carafes = 4 x 0.6 L fits Penguin and Crystal bubbler (household goods)
Soda Stream! Offered as above: 2xDuopack = 4x0,6 L for 20 Receiving: 2Flaschen! If the supplier complained, without success! So the problem is not with Amazon, but with the supplier!