I thought about doing the same thing with my Thermarest self inflating mat, let it inflate, compress, repeat a few times
So, I started weighing it to see if I needed to do this
But since the weight always is the same it must not be accumulating moisture so I just don't worry about it
It might have a little mositure, and then stuff could be growing in it. Too bad it's not clear. But as long as the weight stays the same I guess I don't care.