I carry all 10 on 90% of all my hikes, solo or other wise. There's also a secondary list from HikeSafe of which I carry must of as well.
Sturdy Footwear and Extra Socks
Watch
Trash Bag (for trash or rain protection)
Light Plastic Tarp or “Space” Blanket
Guidebook
Insect Repellent
Sunglasses
Sunscreen
Gloves or Mittens
Personal Medications
Cord/Rope
Gaiters
Extra Batteries
I put a small piece of plastic between one battery and the contacts in my spare headlamp so that won't happen. I also reverse one of the batteries in my flashlight (guess i could do that to the headlamp also). If my spare batteries are loose i put a small piece of elect tape on the pos end so they cant accidentley make a circuit. Had some replaced batteriers in my pocket once with loose change and they shorted out and gave me a hot seat.Yeah, extra batteries are key. Apparently my headlamp got turned on in my pack and was dead when I pulled it out Sunday evening (and I had just changed the batteries on my last trip).
The sun moves (approximately) 360deg/24hrs =15deg/hr = .25deg/min.If memory serves, the sun moves one diameter every 15 minutes, so you could estimate time til sundown.
I did 8 out of ten. I do not typically carry rain pants but make sure I have something to cover my legs. in the summer if I am wearing shorts, I usually have a pair of polypro long johns. I don't know how much is enough extra food so I am not sure if I carry enough.