Here is a picture of our sodastream we bought one over here as well. It turns out they have been around here for a long time. Pictured is the now empty gas bottle next to the sodastream. It is about 2 1/2 times the size of the Kiwi bottles and has lasted much longer then the Kiwi bottles. I'm very happy to have one of these again it was starting to cost a lot in terms of bought water and fridge space! Now we have make our own carbonated water.