Wouldn’t they bulge or explode? The pressure is higher than carbonated soft drinks, no?
Thats why there was a cry of “bollocks to this idea” by folk in the industry, 50 psi or 3.5 bar in a plastic bottle with a plastic cap would lead to explosions
They are stronger than you would think. I had a ghetto tubeless inflator made out of a 2L soft drinks bottle with the normal cap and it could take at least 120 psi no problem. May have been more prone to eruption if bumped by something pointy though… but left on its own, I wouldn’t worry about it (unless it was under my pillow)