When I bought this cel for like $20 3 years ago, I 
had no idea how massive it was till it arrived on 
my doorstep.  Although these measurements don't 
really compare with some of the ones I've seen in 
this thread, 13 x 17 is pretty big, and by far the 
biggest one I own, although I have a few other BP 
cels that are comparable.  : P