I have to highly agree with Machias. They make the LED windup flashlights and they usually can use 1, 3 or 5 bulbs and have an alarm sound on them which might not do any good for being lost but would probably scare the crap out of any predator atleast for a little while. They usually are pretty durable and I think they are around $20 and really light weight since they don't have any batteries. I don't know a brand name but I have seen them just about anywhere big 5, drug stores, target, walmart. Probably the safest last resort for light. I carry one in addition to a normal flashlight (I have the smaller mag light which I keep in my cargo pocket on my pants so if I get seperated from my pack I still have light). Good luck