1kg = units of mass destruction?
The Bulgarian Airbag cannot be a measure of mass since these airbags (with or without bee attacks?) are definitely a measure of weight - they are heavily exposed to gravity.
Slightly off topic: I know there are some measures for land around but what about a quare measure for, let's say, a dessert? Would be called the Steve Fossett Ground Search or SFGS or, in colloquial language, just a Fossett. I'd suppose, 1 Steve Fossett Groud Search would be about the size of the Mojave Desert.