Originally Posted By: Montanero
Chaos, I would actually add "Plan" to your list. It helps to avoid the problems, and a good one can help to solve them as well. While it is not an "item", it does (or should) utilize your most useful and important survival tool, your brain.

Well said.

First, in my mind, is the mission. The mission for most or all of us should be, "make it home with the same number of family members, and holes in your body that you started the day with."

The mission informs the plan, and the plan informs the equipment.