Disposable Balloon Helium Tank Now you can fill your party balloons at home! This lightweight, disposable helium-filled tank fills approximately 20 latex balloons (12; float time of 5-7 hours), or approximately 20 mylar balloons (18; float time of up to 4 days). Includes disposal instructions. Balloons sold separately. Approximately 14.9 cubic feet of helium; 18"H. (Caution: contents under pressure. Keep out of reach of children.) PLEASE NOTE: Non-Returnable. Standard Ground shipping to street addresses within the 48 contiguous states only.