Cereals ready-to-eat, POST, GRAPE-NUTS Flakes: cup (1 NLEA serving) to Grams
Quick answer
One cup (1 NLEA serving) of cereals ready-to-eat, post, grape-nuts flakes weighs 29 grams.
1 cup (1 NLEA serving)29 g
Reference serving (nutrition facts)100 g
Source: USDA FoodData Central - SR Legacy (2018-04) (USDA household portion weight)