I’ve seen them on Amazon; they looked interesting. If I recall, though, they are about 3 ounces each, which is a bit heavier than 1L Smarwater bottles? Of course, you’d have to fill the Smartwater bottle twice...

I did see that Evernew came out with a 2L ziploc-opening bag, but the reviews said the opening was a bit small to use effectively.

Thought I might try something different with the Smartwater bottles. If they don’t work, I’ll take a harder look at the CNOC. (With CNOC, I’m wondering how it might work using a blue 2L as the “clean” container doubling as a drinking “bottle” and the orange as the “dirty” container. Any thoughts?)