For the Water Goddess — the one who would rather refill the jar than buy the jar again.
Two bobbins of natural floss, sold on their own, because the glass jar you already have on the shelf is doing perfectly well and does not need replacing. You drop the new bobbin in, rethread it through the dispenser, and carry on. That is the whole ritual. Roughly 120 uses before you think about it again.
Keep it in the medicine cabinet behind the jar, or tuck a spare in the travel bag so a hotel sink never sends you back to a plastic dispenser. It is the smallest possible way to close a loop, and closing small loops is how the big ones eventually get closed.
Two bobbins of floss · approximately 120 uses · refills any previously purchased glass floss jar · no new container needed