Off the top:
I'm surprised it took Doug to mention the AMK kit, IMO
Start with Doug's AMK as a minimum.
http://www.adventuremedicalkits.com ( pocket survival pak )
Then add a small AMK Medical kit as a minimum.
http://www.adventuremedicalkits.com ( Ultralight / Watertight .5 - 2010 Edition )
Extra daily meds if you need them.
A few HD pain killers, Codeine with Tylenol or Aspirin
A 1 or 2 liter Platy water bag.
Don't forget the water tabs.
Space blanket (HD or lite wt.) or AMK bivi, or both.
Extra para cord.
Carry these items in a Ribz "vest" this will enable you to use your favorite flotation device. IMO, a copy of a SEEK II Mil Vest but still a great product.
http://www.ribzwear.comA naglene bottle with a cook cup or HD foil pan for cooking and forget the hard bottle.
A few powerbars, stay alert gum, coffee/tea/sugar sticks
a roll of lifesavers candy and you should be good for a
day or three.
If you are in Bear country I might pack a .357
and I take for a given that you already have a pocket knife and sm. light to include in your vest.
After reading below I agree on the REI matches and trash bags are always handy, better pack at least one.
BUT:
In the PNW with rain you might have a need for real shelter
and you will not be able to have it with just trash bags without cutting them for a tarp.
A Space blanket can serve as a tarp, reflector, blanket etc.
a plastic bag can as well but not serve "as well" !