PET plastic bottles provide an excellent air/oxygen barrier. They are used as soda and seltzer bottles; they keep oxygen out to protect chemicals as well keeping carbonation in when used as soda bottles. I use 1-liter plain seltzer bottles (2 liter bottles are also available). Other features are they can be squeezed to a large degree to remove air from headspace, have strong caps, and are basically free. Because they are clear, they need to be stored in the dark (or a plastic tote, which you want to do anyway to contain any spills or leaks).
I have used soda bottles had great luck. I buy PET amber "Boston Rounds" 32, 16, 8, 4, oz bottles from Freund Container, they will sell you 1 bottle or 1 million. You can choose your cap. I would caution not to use PET with E-6 Color Developer it embrittles the plastic and they can crack. I keep stock XTOL for 18 months in full (Absolutely full) bottles. I have used 32 oz amber glass bottles, with poly-seal cone liner lids, definitely the gold standard.
I worked as a chemist and we would eliminate dissolved air in pure water by sparging (bubbling) with Helium gas. The government was paying for that, not very economical for a darkroom.
. Most liquid chemicals come polyethylene bottles (Like Jobo) very chemical resistant but you can't see whats inside.
Best Mike