OK, have we all had fun now? I'm actually a bit sorry for piling on the newbie moosejah, but it IS tempting when someone sets themselves up as such an obvious target. (Sorry dude, it's true.)
And, just to show that there's no hard feelings, I'll even let you in on the big secret; a rasta bivi kit is considered by some to be the ultimate lightweight solution to an unplanned night out in the hills. A nice fat glowing herbal cigarette apparently can make the long cold dark times more entertaining.
Personally, I'd prefer a tent, thick foam pad, and warm bag for an adventure like you're planning. I hope you have a great time on your trip.