I mix the ratio up a bit depending on the season and how much humidity retention I need. But I think 70/30 is a perfect starting point.
....and I told you that you'd run into glass bashers!!! Hahaha. But seriously, glass works just fine. I've been using it for almost 20 years, and millions of snake keepers do as well.
I'm just getting home, let me get those pics for you in a few...