The French Dip Max is like the Double Stacked Reuben, it has double the meat. What will make the Arby’s French Dip better? Instead of the normal 3.5 ounces of roast beef you get 7 ounces. Your Arby’s French Dip Max comes on a sub roll with 7 ounces of thinly sliced roast beef and their French dip sauce.