If this were my bug-out bag for walking, these items (and more, of course) would be in it. In fact, many of these items are with me whenever I'm in my car. I also keep a backpack in my car (SUV).
Petzl Zipka Plus 2 (headlamp-wristlamp)
http://www.rei.com/product/829552/petzl-zipka-plus-2-headlampFenix E11 Compact 105 Lumen Flashlighthttp://www.amazon.com/Fenix-E11-Compact-...;keywords=fenixThermarest closed-cell foam sleeping padhttp://www.amazon.com/Therm--Z-Lite-Slee...ords=thermarestFleece Sleeping Bag Liner (if it were winter, I'd lug a real sleeping bag)
http://www.llbean.com/llb/shop/43014?feat=1097-GN2&page=cabin-fleece-sleeping-bagMy favorite Mora (it's a close call, love all my Moras)
http://www.amazon.com/Mora-Sweden-Knives...p;keywords=moraWalking staff or trekking polehttp://www.rei.com/product/830442/leki-wanderfreund-antishock-walking-staffTarphttp://www.rei.com/product/798413/blue-poly-tarp-8-x-6Titanium mug and/or cookset (worth the splurge, in my opinion)
http://www.rei.com/product/668927/snow-peak-titanium-multi-compact-cooksetTitanium wood stove (I'd start with it, might toss after 50 miles...)
http://www.amazon.com/Vargo-Titanium-Hex...nium+wood+stoveCompass (you can certainly find them much cheaper - but I have this one)
http://www.rei.com/product/787189/suunto-mc-2-pro-compassFiresteel (and a couple Bic lighters and UCO or REI "Stormproof" matche)s
http://firesteel.com/firesteel-survival-with-scraper-and-lanyard/Nalgene 32oz water bottles (4 of them)
http://www.rei.com/product/402049/nalgene-wide-mouth-loop-top-round-bottle-32-fl-ozLeatherman (one of the cheaper, lighter models)
http://www.amazon.com/Leatherman-831207-...ords=leathermanOdds & Ends: cotton balls-petroleum jelly for firestarter, construction and normal big garbage bags (so useful for many things - including lining your pack and for a rain poncho), moleskine (mini note pad) and pen, paracord 550,
Clothes: Marmot Pre-Cip rain parka, Marmot Dri-Clime jacket, hat, long underwear, gloves