I just came across an ad in guns and ammo mag for a ccw computer bag from blackhawk. It says it will hole the largest of computers and has an exterior back panel that holds 2 mags and a center pocket for a handgun. But for $120 it seems a bit steep. But it is a ccw bag from blackhawk.
I can't find it online, but I like the sound of it. Thanks for all your help guys, I agree carrying on your body may be much more controlled, but sometimes that is not feasible for students, or cyclists.