another +1 for ortlieb. i have had mine only for a few weeks but i already love them. i got ones with shoulder slings so i can easily carry it off the bike, which i could imagine would be helpful for commuting to college. the ones i have, i believe the 25L size might be able to fit a laptop and notebooks but i wont say without trying it yourself. if you can find a store that has them in stock you could check them out first!