Sorry, I just read your questions today and see that nobody’s chimed in yet. I just tried this, and it seems to work as well as it does with any regular comic bag.  This is obviously better than using a regular backing board that is only “spray-buffered” on one side.  This is a 725 Mylite2 with a 700 Half-Back. It should work well for modern books if you’re that strapped for space. Good luck!