Clif bars. CamelBak Elixir or Nuun (I actually really like Nuun).
I don't get the "Low fat" thing, I pile butter onto my food before I leave (breakfast includes lots of food). Energy, burn lots and lots of fat cycling.
Why the egg whites and not the whole egg? I eat the egg specifically for the freaking yolk; the whites are crap, they're worthless.