If you don't want to be without sparkling water, the SodaStream Reserve Pack CO2 Cylinder + Bottle is the right choice for you. The set consists of 1 CO2 cylinder and a Fuse bottle. The cylinder is good for 60 liters of sparkling water and the Fuse bottle has a capacity of 1 liter. Create 1 liter of sparkling water directly in the Fuse bottle and keep it in the fridge, so you'll always have a supply of fresh, sparkling water on hand. The Fuse bottle is only suitable for the SodaStream Spirit.