Chaos -- Nice set-up. I'd add food ( bars of some sort)
Paper records ( map, bus sched/map, phone numbers) Tiny radio?
Assumed: cell phone, cash, amusements.
I should have mentioned that I always have at least a few snack bars in my laptop bag.
Maps were rejected as being too bulky and unnecessary -- I know the local area very well. The train schedule is sparse enough that I've largely memorized it. If my phone is available I have all my contacts (and a GPS, and the train schedule, and so on). If it's lost or broken I have several important numbers memorized.
A tiny radio is a very good idea, I'll look into adding one. I carry an iPhone, at least $100 cash, a book to read, and a USB battery that can recharge my iPhone completely, twice. Not to mention my laptop, which is almost always fully charged.
If I were going to carry more food, I'd probably take a Mainstay bar over an MRE entree. The possibility that I'd need more food during a train commute and couldn't buy it seems too remote to justify the added weight and bulk.