The one problem I've had with the garment bags is that, for the life of me, I can't find one tall enough to hold a 36 exposure roll. I just can't!
So make sure you get one long enough for that, plus any additional items you might put at the bottom (like...some wood with a lightbulb).
Mine worked great for me, and I added a dangling wire mesh type thing to the top so that I could use my clothes hanger clips. I couldn't use them on the wire frame that gives the bag shape, because there wasn't enough room at the top. So I just strung a bunch of wire in several directions. I then used just some duct tape to create "stops" so that the clips couldn't slide too far, and to keep the film from touching. I was able to fit as many as 9 strips of film in there at a time.
I used filtered air from above, rather than heat from below. Took about 45 minutes for me. I just hang dry now. I'm not in a hurry.
allan