Started out hiking with the ten essentials, which were later expanded by various emergencies on the trail (snakes, ticks, disintergrating boots). The Wilderness Basics Course (Sierra Club) I attended a couple of years later refined it and added some skillsets (off trail navigation, flora/fauna, cold weather, and basic tracking). After I had to evacuate in 2007 because of the wildfires, I started thinking about kits for home and car use as well.