Really hope they'll improve their bottle. Bought thru Amazon, the dispenser was brim full, bottle has only that one opening, no way to get product back into bottle. It only takes 5/16 oz. to treat 5 gal. gas, their smallest increment is 1/2 oz. which makes it pretty much useless. I emptied it into empty Stabil bottle which has 2 openings and 1/4 oz. increments, scratched a 5/16 mark above the 1/4 oz.