Quote Originally Posted by Thomas Bertilsson View Post
I understand the theory, and I thank you for posting it. What it doesn't explain is why the accordion bottles still work fine.
There are various anecdotal ways the following truism has been said, the exact numbers don't matter, the concept is born out in my experience.

"Perfection is illusive and expensive, every half step toward perfect requires double the effort of the previous step. The first 50% of quality is possible with limited attention and effort, the next 25% takes twice that effort, and so on."

So as a possible example in the case of the accorian bottles the first 50% is available just by putting it in a bottle (any bottle rather than staying in a tray), squeezing out the air may get us to 75% of perfect, keeping it away from heat might get us to 87.5% of perfect.