You are more likely to get hurt and in trouble in the woods than lost and in trouble. Something as simple as moleskin can keep you going when your feet blister. A small mirror can help you signal as well as get that hunk of debris that hatchet kicked into your eye. And a space blanket will keep you dry if you break a bone and have to wait for rescue. You can put all three of these items into any kind of pouch you have the rest of your stuff in, and add a couple of ounces and no bulk.