Not that I know of (although that would explain a lot). No, I was referring to unobtainium in the more general, pre-Avater sense of a “magical” material of the type employed by comic-book writers to explain away sloppy physics.
In other words: it’s a superhero movie. Don’t think about it too much.
ISTR, in some official Marvel character guide (this was probably back in the 1980s) that the suitcase itself had repulsors to make it portable (due to the weight of the armor).
It’s like in Voltron. How come the Ro-Beasts were just stadning around for the 5 or so minutes that it took for the team to for Voltron? And howscome they always used a bunch of different weapons that never worked until they used the blazing sword at the end? Why not just use the blazing sword? Is it something like in the military where if you don’t use all your ammo, you don’t get as much alloted to you the next fiscal year?