I don't camp, but this is what goes in my small drawstring backpack:

• Phone recharger and cable

• Etymotic earplugs

• Spare Cheaters sunglasses

• Sunscreen spray and lotion

• Hat

I also bring these along day 1 and stick them in a locker:

• Sweats

• Face masks (kind of like these, but I get them from work.)

• Goggles

I got stuck in the duststorm in 2013 and it was a nightmare. I was hacking up black crap for days. I haven't needed that stuff since, but sure as hell would like to have it handy.