There is a well known solution. Look at most PET bottles. The thread (mostly on the cap) is not continuous. That's for the pressure to relieve before the cap is off, and that could happen from a coke bottle or so to you.
There is a well known solution. Look at most PET bottles. The thread (mostly on the cap) is not continuous. That's for the pressure to relieve before the cap is off, and that could happen from a coke bottle or so to you.
You have to activate it manually?
No, it's activated by pressure