Wow... great list!
Just a couple of little things to think about...
1. You have several ditty/stuff bags - do you really need them for a 2 day trip?
2. Your water bottle are pretty heavy. I've gotten into using smartwater bottles (1L, 0.6L, 0.5L), super light and slide nicely into your pack pockets.
3. Ditch the spare undies & shirt for a 2-day trip, just keep the sleeping socks to keep your toes toasty at night.
4. +1 on the headlamp idea - you can get a tiny super-bright LED headlamp for about $20 at home depot, or more expensively from one of the camping stores.
Have fun, matey, and good luck!