I figured as much. I'm not ENTIRELY sure of the exact distance, I know it's 12 miles one way by car, garage to parking lot at work, so no more than 15 by bike. I live in San Diego, so the ride will be a lot of street, though with as early as I'll be riding, I doubt it'll be very busy, and I'd have to drive the route to determine hills, but I don't think there's many of any significance.
My things would be limited to stuff like wallet, keys, phone, with possibly a uniform every monday and friday. Nothing I couldn't fit into a backpack.