The question pretty much says it all. So far all of the bottles I have found have breaks in the threads which I've been told makes homemade sodas go flat faster. I was considering picking up some sodastream bottles if standard caps fit them since I would assume they do not have the breaks in the threading.

The ultimate goal is to keep homemade sodas from going fizzy as fast as most commercially available bottles (1L, 2L, 3L, 12oz, 16oz, 20oz, 24oz) have small breaks in the threading to make drinks go flat faster (to keep you going out and buying more soda).

So the question is, do sodastream bottles use standard sized caps (28mm)?

  • Can you give an example of Normal 28mm? for comparison.
    – MandoMando
    Mar 11, 2013 at 13:41
  • Just about any 1L, 2L, 12oz, 16oz, or 20oz bottle will be 28mm. It's the standard size threaded cap.
    – Matthew
    Mar 11, 2013 at 13:43
  • This is an engineering question, not a culinary question.
    – SAJ14SAJ
    Mar 11, 2013 at 13:51
  • 2
    @MandoMando Me? I am innocent.
    – SAJ14SAJ
    Mar 11, 2013 at 14:05
  • 7
    I'm not sure I believe the bit about the broken threads. Soda caps seal on a soft membrane under the cap--the threads have nothing to do with it. As long as the cap threads down securely, the seal is made between the top of the bottle and the inside of the cap, regardless of whether the threads are broken or not.
    – JoeFish
    Mar 11, 2013 at 16:02

3 Answers 3


No, the sodastream caps are big enough to fit a standard bottle cap inside it entirely. Practically everything about the sodastream is made in a proprietary manner to make sure you use their products as intended and never interchange them with something else (and can only purchase replacement parts from them)


Soda stream caps

Here's a close up. I don't have any in my personal possession, but by examining the pictures, they do appear to be the normal 1-liter sized cap, used on Pepsi products. I welcome some additions to this answer, if somebody has access to the physical caps.


Having measured the caps recently due to looking for suitable alternatives. The outer diameter of the sealing cap is 4cm, the bottle' screw neck is 3.5cm. So a normal pop bottle is too thin to use with sodastream as your probably aware of by now & you can now buy adapters for smaller necked bottles on ebay & suchlike, however I would not recommend an normal pop bottle being reused as it may explode under pressure due to the plastic being too flexible & previously being carbonated. If you live in the UK then Asda seem to do a £1, 750ml hard bottle with a 4cm outer cap that seems suitable but I need to go back down & measure the neck.

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