1. Good nondescript backpack - Make people think you don't have prep stuff inside. Also good to allow you to be mobile.
2. Portable water filtration system - So you can keep a move on while also making it easier to not be sick.
3. Good lightweight tarp - Make a good tent from it, able to block off a cave opening, etc... You can have many uses from this.
4. Hatchet/Axe/Machete/Folding Saw - Good for making camp wood. Also not bad when used to defend yourself.
5. Bow string - Make a bow from it along with being usable as a fishing line in a dire pinch to being able to make a fire bow with it.
6. 550 Paracord - Many uses. More than I could list here.
7. Good multi-tool - Something that isn't some cheap Wal-Mart Chinaware. (I have a Leatherman Mut with the bit set and the extra bit as something I carry everyday.)
8. A sleeping bag bivvy with either a down feather insulated sleeping bag (If you are in colder weather) or a warm weather 3 season sleeping bag (Warmer climates.) Almost required to go together.
9. Lockpicks - Help me get into shelters for the night through covert means (If I don't break down a door or bust a window to scavenge, then I can leave no trace.)
10. A set of bolt cutters or a sharpening stone are tied on my spot.