Oatmeal or granola for breakfast, banana and sometimes trail mix around 10 am. Lunch is leftovers or a grilled cheese sandwich, with some sort of fruit/veg (usually an apple or salad.) I have glass containers with a locking lid which haven't leaked yet (2 years), so I bring soup or chili or whatever I feel like, really. 40L panniers swallow lunch, clothes, shoes, lock etc pretty easily.