Would be nice to have an option to hide them when they have stuff in them too.

You should never have nothing in them... Maybe when you start a character. But I agree, and option to hide them regardless, this falls in the category of "let me hide x elements of the ui". Can we have this? I don't need to see everything. If I'm grinding on a character with a lot of play time, I know what's what. I really only need to see my mini map (maybe), my hp energy mana bars, and my skill cool downs. This game is soo beautiful but soo cluttered :(.