As much as we try not to drink too much soda, there are always times — parties, open bar, etc. — that it's nice to have some two-liters around. Alas, they seem to go flat before your very eyes — until now. The FizzKeeper ($4) is an ingenious little gadget that goes on top of your bottle, replacing the cap. When you're temporarily finished with the bottle, give a few pumps of the ball on the top of the 'Keeper, and your fizzy drinks will taste just as fresh as when they were opened.