Co2 "exhale bags" or similar. What's your opinion?

That's exactly what the search query will provide
Lots of anecdotal claims pro and con, but I didn't see anyone who did head to head grow reports where the only variable was CO2 bags.
OTOH I've seen the results of a controlled environment with regulated atmospheric conditions but that's a $7.5M grow room. Even for them it's probably overkill because they'd have commercial quality results anyway.

[edit] and that's tanks not bags
 
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