when I make mine, I make the back fabric into the binding. The backing fabric is wider than the front/sandwich so I just roll it up over the edge to make the binding.
I've been told that it's "old-fashioned" & it's the way "they USED to do it", but mine are working quilts & I like doing it this way. I learned it from my Grandma & my dad. :)
PS - I am NOT slamming any one else's technique.