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Disposable Helium Gas Cylinder Capacity: 0.25 Cubic Metres of Helium Gas. The small disposable helium gas tank will about inflate 30 9 Inch latex balloons, 15 of 11 Inch latex balloons or 12 of 18 Inch Foil Balloons The pack does not contain any heli-valves. For best results, fill the Balloons 1-2 hours before your event. The float time will also depend on the size of the balloon.