None. DS15 barely has enough room in his backpack for his books and he won't carry a lunchbag/box around in his hand. He also has to carry extra clothes and sports equipment everyday, too.
We gave up - I just started putting money into his lunch account. He usually has open gym or weight training at 6am, so he gets breakfast after, then buys a lunch, then buys a snack after school on his way to practice or a game/meet.
In the beginning of his freshman year, I was buying all kinds of lunch stuff for him to make a lunch with and tried to hold out thinking he would eventually make a lunch or starve. He starved. sigh. I broke. (and I *am* broke paying for his lunches....his cafeteria has "pods" like Disney Food Courts. Pasta station, Wings station, Grill station...etc, that are upwards of $6-7. The "daily special", that was always gone by C-lunch, was $4.50.