My friend, That Farmer Guy, send me the following news about soy sauce:
Based on nothing but my empirical observation, the garden variety Kikkoman seems to dominate the international soya sauce market, but this other Kikkoman product (Shiboritate) is the nama-shoyu version (raw, fresh-pressed) and is packaged with an interesting hack that prevents oxidation and tastes different (fresher? better? you decide).
The trick is a special cap that attaches to a bladder that holds the sauce inside the squeeze bottle, and prevents the sauce from air contact, at least until you use it.
Image: That Farmer Guy