How much Helium will fit into a 7 Cloud Buster Balloon?
If you like life on the wild side and want to fill the balloon to it’s capacity it would take 120cu. ft. (approx) However most people use about 65cu. ft. (approx) which makes the balloon about 5′ in diameter. Filling the balloon to a smaller size will make the wall of the balloon thicker and therefore less likely to puncture.