I'm with Aimless. Most of the hiker rescue stories from around SoCal involve people who go out with little or no gear, no extra clothes, no light, no map or gps and little food or water. I've done that on a local loop trail, but if I'm in unfamiliar territory, I'd rather have enough with me for at least one night, including a small pot and stove, especially in winter. In Yosemite, I took enough for overnight when I did day hikes away from my camp with snow on the ground.

Adventure is just bad planning - Roald Amundsen
_________________________
Don't get me started, you know how I get.