Can you use a second balloon?
I've managed to find the necessary supplies to make another balloon, and I'm not aware of any other uses for one of the items, so I made a second balloon ... but it won't let me equip it.
Is there some other upgrade that I need to make before I can use it, or did I just waste some supplies?
It seems that someone has posted a video :
So no, you can't use a second balloon, but you can get a blueprint for a 'double balloon'. View the video for the spoiler on where to get it.
And yes, I wasted my resources.