>(A backpack would probably feel better than a messenger bag, but my local train line is often too crowded to carry a backpack)

I've commuted on the Central line in London with a backpack and it's fine. The only place where it might get more rammed is Tokyo - where you get shoved onto the train. Just put it on the ground between your legs.

> checks /u/ramchips' user profile

>see's ramchip is in Tokyo

Well, uh. Carry on then.