I have the large Tutto, they are expensive; but worth every penny. The Tutto has lots of pockets so you can carry a 11"x17" cutting mat and various rulers; most anything you need for a class or retreat.
I bought mine @ the local Bernina store when she had everything priced 30% off. It fits both of my Berninas and Pfaffs, it's too bad I need the huge size for my HV Sapphire 875.