Do you always carry the 10 essentials when you are out there?
1. Flashlight/headlamp, spare batteries and bulb
2. Fire-making kit
3. Signaling device
4. Extra food and water (water is a more pressing need than food)
5. Extra clothing
6. Navigation/communication aids
7. First aid kit
8. Emergency shelter
9. Pocket knife
10. Sun protection
11. Insect repellent (bonus item)
This is what I carry in my "grab bag" inside my truck (plus a few extra items).