I should also admit that I was once one of the unprepared. Roughly 15 years ago I went on a moonless backpacking trip. As dusk approached, we walked maybe 1/4 mile away, through thick woods, to a beautiful rock outcropping overlooking the valley. I had my trusty mini-mag light. LED flashlights were in their infancy, and I knew nothing about them. I was very tired, and left the rock outcropping before everyone else, to go back to the tent for some sleep. Half way back, my mini-mag failed due to old batteries. I didn't have a back-up light, or spare batteries. After tripping several times in complete darkness, I ended up crawling most of the way back to the campsite, mostly be sense of touch. Now I carry a Quark flashlight with the 18650 battery tube, and (2) spare 18650 batteries. Also always with me now is the cell phone. The cell phone backlight is good for navigating a dark house, but the video light offers significantly brighter light. I saw an Android app on a friends phone that displayed a flashlight, and lit the video light. It actually had several brightness settings. If they would only drop a Cree LED in the cell phone!