I've had a couple cels framed in much the same 
way one would frame a photographic transparency: 
Leave it in the bag and mount the bag to the 
matting by a couple pieces of tape at the top so 
that it hangs freely.  This seems to work well; 
it puts no stress on the cel, I think I saw that 
method mentioned on some of the online cel 
framing tutorials, and by explaining it in terms 
of a transparency I know that the framer and I 
are talking about the same thing.  

Now, however, I have a couple of cels with 
backgrounds that I would like framed and it 
doesn't look like this method will work.  The 
backgrounds are significantly larger than the 
cels so I don't think the whole thing would fit 
in a bag. Besides, I doubt the setup would look 
very good with a bag covering the cel to keep it 
from adhering to the background and another bag 
over the whole thing.  That's a lot of stuff 
between the viewer and the image.

So, does anybody have suggestions on how to frame 
a cel with its background? None of the online 
tutorials I found have mentioned backgrounds.

Thanks much,

Zach