Back in 199x plastic bottles with soda would sometimes explode inside the bag when we'd be walking on a hot day - it were earlier years of making soda in large plastic bottles in Russia and it was all "bottom line optimized" like visibly cheap low quality plastic, etc. And about 20 years ago a woman in Russia got her eye injured by the metal cap that flew off a soda bottle she tried to open. She sued the manufacturer ("Bravo" - once opened their metal cap had the lower band still attached and broken with couple sharp edges sticking out) - don't know the full results, yet the manufacturer started since then to use plastic caps instead of metal.