We'll probably get some use out of that change, since we tend to take two of our mugs with us in the morning (DH has to have his coffee and I need my tea) and then tuck them in the backpack when they're empty. I could see us getting refills at the BC as we walk from Epcot to MGM or at the Poly after dinner for while we watch Wishes from the beach, since we'll most likely have the mugs with us anyway.