Tuesday. There is a dilemma. Small balloons are tight. Big balloons are soft. And what size is perfectly balanced? My anwer for today is 18 inch. These ones feel just right - merely soft yet still pretty tight. Robust enough for me to be quite rough with them. And big enough to place my butt and even my feet on these loons. In short, 18 inch balloons are good. I've just sitpopped 5 of them and can confirm that is was pretty awesome!