Personaly I find that a packs weight can sky rocket when you enter the realm of "paranoia packing", specificaly in regards to the extra food/water and clothing.
And sun protection? I find it hard to consider sunscreen and sun glasses essential, smart possibly depending on the trip, not essential.
I carry five of these items (1,5,7,8,9) and an orange whistle double bagged in zipplock bags in a tiny little cloth pouch in my pants pocket. My buck knife is right next to it if it isn't on my belt and my headlamp is forever around my neck.
As for the other three (2,3,10), they all fall under proper clothing as far as I can tell.
Oh and a compass with a mirror, to be really specific, might be something to add to the list. Good for more than just shaving.