Jon,
I noticed that Acorn continues to modify and improve most of their bags. The "Large" saddle bags now seem to have gone back to the drawstring inside (instead of the recent zippers) and two leather straps to hold the flap down (instead of the more recent single shock cord). A nice new touch (in my opinion) is the replacement of the larger and wider side pockets with flatter zippered pockets on the sides.
Those new flat side pockets make the bag a little more narrow and "streamlined," even a cleaner look. I never liked the larger side pockets on my old Carradice bags much.
Though the leather "flap" straps are a bit slower to deal with than the single shock cord on the flap, I think they lend a nice look, dare I say "retro'? And a bit more secure, I feel.
My 2 cents. I have been a big fan of Acorn and their "MUSA cottage industry" model. The workmanship has always been superb and pricing is super fair. I've probably owned more than 18 of their bags over the years. Great folks to work with, too.
Paul Germain
Midlothian, Va.