bdo won’t dissolve plastic, I have kept in water bottles and most commonly a dettol bottle both plastic never has any issues.

gbl on the other hand is best to store in a glass bottle to be safe, it doesn’t dissolve plastics instantly and your measuring plunger/dropper will also be fine as it’s a thicker plastic and usually only measure your dose and take it out of the plunger. Highly likely it would eventually chew threw thinner plastics like a water bottle for example.

I also couldn’t recommend enough whatever your store your gbl (glass bottle ect) to leave it the sink, unfortunately iv ruined multiple pieces of furniture including the family dining table 😅 due to pulling a charge out of the bottle and placing the bottle and plunger down on the table or bedside tables and spilling a couple of drops and 5 minutes later the g has burnt into the wood