Do you mind my asking which ones you use? The only ones I've been able to find (Canada) don't work with the standard soda stream
Looking at the Canadian website, neither is sold in Canada (1 for a link on the German website). There is the SodaStream Duo which supports a different type of glas bottle. Might be easier to source locally, but exists only with the quick-connect cylinders and is a bit expensive for what it is, at least if you buy it new
[1]: https://sodastream.de/products/crystal-3-0?variant=404654832...