My current set-up is:
- Single speed bike
- Large waterproof backpack to carry food, work clothes etc. (NB: I'm not actually sure it would be convenient to attach panniers, but where there's a will, there's a way, I suppose)
- I wear football shorts or normal tracksuit bottoms over cotton underwear
WELL DONE ON MANAGING SO FAR, but have you considered putting your bike on a train (for at least part of your
journey, if that is an option?). I know that wasn't part of your set up, I just thought it might lessen your tiredness somewhat.
Good luck with whatever you decide to do.