I doubt that thing could have gotten very far off the ground with a 6 year old in it. They are pretty heavy! At the very least the box would have easily ripped right off. The balloon might have had the "theoretical lifting capacity" to lift such a weight, but it did not have the structural ability to do so, it would have just ripped apart or away from the box.

I thought it sounded dumb/fake as soon as I saw the article....

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)