Exp. 2/08/2027 This 3-pack of Kellogg’s Frosted Krispies Breakfast Cereal, in family size 17.1 oz boxes, makes it easy to bring a little magic to your day. Each serving size is 1 cup, with about 13 servings per box. The cereal has a marshmallow flavor and contains 150 calories per serving. Made with crispy oven-toasted puffed rice cereal, Rice Krispies are a healthy and satisfying way to start your morning.