If you want square away some for long term storage, you're better off with brown glass bottles filled to them rim. Any air left will interact with the nic base and turn it darker. Won't affect the quality, though.
Plastic is always a bitt iffy. There's so many different types out there. Some may be ok, some might not be. With glass bottles you can be sure that there won'T be any interaction between the bottle material and the nicbase.