If anyones interested in the numbers, we tested this in lab last year.
Max psi = bottle failure of some kind. It was never the cap unless we compromised it in some way, like heat treating it. These are all averaged numbers of perfect bottles, so some went higher/lower. We never did glass because of the danger involved but i want to say the professor said it was higher than the plastic, i just can't remember for sure.
new thin walled 16.9 oz water bottle - max psi ~175 psi
thick walled bottled water bottle - max psi ~190
16 oz soda bottle - Coke max psi ~190 psi. Pepsi max psi ~195. Im not sure if pepsi is actually stronger or if we got lucky with ours but thats how it averaged out.
2L bottles - ~165 psi
We did a few others but i dont want to put them all up to show how way over engineered they all and how strong this stuff really is. Also the strength of the bottle goes down if there are imperfections like creases from squeezing . On a cool note all these bottles go well above 200 psi with a little tape reinforcing.