You can also just combine all the bags into one. Basically just make a new bag and copy all the sections of the other bags into it. If it looks good, delete the other bags, or just set them to not show automatically. Good chance to make your own categories and sections, too. A single section for each of your tradeskills for example, divide the armor pieces you can use from those you can't use and such. If you like the work. If you are lazy, or afraid of baggins' config menu, then it's probably best to use another bag-addon or go back to onebag. :)
Edit: If you do the above, and edit your categories as well, make sure you do not create two categories that get all the stuff that fits in no category. Dunno if that still is a problem, but I vaguely remember that it was in the past, and that it gave quite a headache. :)
Well, that worked like a charm and am still knocking my head against the wall that I didn't think of it myself. Too obvious I guess :D Have one nice bag now, instead of chaos all over the screen.
Only one problem, I used to have a section for BoE greens and blues I found so that I would immediately see which items I could safely sell. And now, no matter what I do, I can't get that back. It's somewhere in my old WTF and yes, I have kept that somewhere, so I can look it up I'm sure.