I really like your list! A few things to I do to personally modify it (and why):
1. Map (if available)
X 3. Flashlight / Headlamp
4. Extra Food (granola bars and vitamins)
5. Extra Clothes (depending on where I am trekking)
X 6. Sunglasses
7. First-Aid Kit
8. Pocket Knife
X 9. Waterproof Matches
10. Fire starter
X 11. Water / Filter / Bottles
X 13. Insect Repellents or Clothing
X 14. Sunburn Preventative
+ 2, big ziploc bags
+ water purification tablets
+ Magnesium fire starter
+ signal mirror
+ Emergency Blanket
+ Approx 50 feet of dental floss/twine (to hang the food), it’s strong enough to hang 3 granola bars, vitamins, and a ziploc bag!
Sunglasses, Insect Repellents, and Suntan lotion are 'nice to have', but you can survive without them. I admit I carry them but they are not 'essential' to wilderness survival. I carry a headlamp, but not as an 'essential'. Items I carry incase I need to be found are a whistle, signal mirror, and the magnesium (I can spark it at a steady pace to create a strobe light effect). Magnesium fire starter works in any condition, matches can be temperamental.
I know ultralight and SUL people frown upon extra clothes, but if you get wet, you need to be able to put on dry clothes. Otherwise, all you have to stave off hypothermia is a space blanket and hopefully warm fire.
I, too, find it funny that people keep reducing and dwindling items out of their first aid kit. Before we know it, its just a needle, few matches, knife, and fishing line (ya, its meant to sound like something Rambo would carry). If you have your sleeping bag, then you can forgo the extra clothes as long as your bag is in a dry sack. This way you can remove your clothes, use your bag to stay warm, and use the emergency blanket as a tarp to keep the bag dry (assuming it’s a down bag).
Use a ziploc bag as a makeshift water bottle - much lighter, no need to build a fire to purify water. Plus, if one plans on using fire to purify, what is going to hold the water?
Mud makes a great sunburn prevention (ugly, yes, but works). I find the funkier I get, the less the insects bother me.
This is how I pack my Items:
Ziploc bag 1:
1. Map (if available)
3. First-Aid Kit
4. Pocket Knife (actually a small, sorta heavy, Gerber multi-tool)
6. Fire starter
8. Signal mirror
9. Emergency Blanket
10. Approx 50 feet of floss
Ziploc Bag 2:
1. Extra Food (granola bars and vitamins)
2. Extra Clothes (depending on where I am trekking)
3. Water purification tablets
3. Insect Repellent
4. Sunburn Preventative
Notice all the ‘Consumables’ (except for the first aid kit, and we hope that isn’t used) are in a separate bag for easy access and to hang if having to overnight.
I know it’s redundant - but don't divide up the essentials between 2 or more people. Too often I see people divide up, or share, some of the things listed above. I REALLY frown at that since the whole idea is these items are what is necessary if you get separated from your partner/group. For that reason, my son carries the all the same items in his pack. Also, for my peace of mind, he MUST wear an additional whistle around his neck at all times (he’s 10). That way, worst case he goes to ‘use the facility’ and gets turned around, he can whistle easily. I'll be just out of sight, but definately within range of the whistle.