Preheat oven to 350 degrees.
Mix soup, gravy mix, water and flour in a bowl until smooth.
Add chicken and mixture to the cooking bag.
Cook at 350 for 45 minutes for boneless chicken or 1 hour 15 minutes for bone-in pieces, or until done.
Mix cornstarch and water in a bowl until smooth. Once chicken is done pour cornstarch mixture into the sauce and stir until smooth and proper consistency.