Looks great Curly. What are those things on your handlebars? Handwarmers?

I'm really looking forward to getting rid of the backpack. Even in the morning commute with it being chily out, my back is all sweaty from that thing. And after the ride home with a 20F increase from mornings, my back is soaked. That's the big thing driving me to get rack and bag, is to ditch the backpack.
Just not sure how best to handle hydration. Use a bottle in the holder on the frame, or get a small, Camelbak that's just the blatter. I'm just thinking that will still leave my back sweaty, especially come summer.