Uuuug… Another plastic bottle question

Well, I just found 3 liters of 100 mg Throat-Hit Nic from Vapers Tek purchased in 2016. Of course they are still in their original plastic bottles. Uuuuug! The bottles are a not a hard plastic but instead pliable and appear to block light as they are a very dark brown color and on the bottom is stamped PETE 1.
What do you folks think? Keep em or chuck em?
It is a lot of NIC, at least for me… hate to check em, but if you think it's the way to go then so be it.

Thanks

Original source: https://www.e-cigarette-forum.com/threads/uuuug-another-plastic-bottle-question.960583/