A light fixed blade knife?
I dont like folding knives out in the woods anymore.
Dont trust em, never really did.
I now carry one of a handful of Scandinavian knives (2 in the winter)... usually Finnish made, but the Swedes make one HELL of a cheap, simple, durable knife.
Generally refered to as the "mora" knife, since thats the name of the town where it is made. It is a dirt simple knife, with a wooden handle and excellent blade steel.
For under $15, you can buy one of these Mora knives, with a 4inch laminated steel blade (NICE!), unfinished birch wood handle (ready to use, or stain, paint, or whatever it), and a well fitting plastic sheath (in the traditional Swedish style).
My wife has one of these knives, hers has the leather sheath, and weighs a shade under 3oz. The plastic sheath looks to be a touch lighter and wont absorb moisture. The plastic sheathed model is called the "SL-1". Probably about 2.75oz.
One caveat is that the handle on this knife is a bit small. There are knives in the same line with slightly larger handles, and correspondingly slightly larger blades, but there will be a weight penalty for that of course.
If you want to try out a slightly lower grade of Mora (but still a VERY functional knife) try out the "#1". Its the same size as the SL-1, but the handle is red painted wood, and the blade is carbon steel, not laminated carbon. The cost for this one is $9.
I buy my knives from Ragweedforge.com
Shipping from him is a flat $5 no matter how much you buy, priority post.