I would keep the wool blanket, and get a Mylar space blanket, they are extremely light. Also would include a nylon roll up hammock, which can be used as an emergency back pack, and a fish net. Also, some hydrogen peroxide, and definitely some Australian Tea Tree Oil. It is the strongest anti bacterial, and anti fungal medicine you can buy over the counter. Make sure it is 100% Tea tree oil, some brands put alcohol in it. Also, for your fire starter kit, add, a small bottle of hand sanitizer, it will light with minimal spark, and add a couple of small rolls of fine steel wool. You an get it at Harbor Freight, cheap. As for nifty knifes, I am not a big fan of SOG brand knives, but they do have a great little folding knife, call Tool Logic, and it has a whistle in the grip, and a Spark bar on the back of the handle and an elongated hole on the back of the blade for ease of opening, and several notches, on the back, to use on to strike the sparking bar. The blade is sharp, and will take and hold a very sharp edge, it has a small section that is serrated. They also make one with a light, and now they have one with the sparking bar, "and" a small LED light. The sparking bar is quite bright, and can be used as a signaling device, and it will set note book paper on fire, with just the sparks from it. I would also include a leather awl/stitcher, with extra waxed thread. Also a couple of small bars of pure bees wax. It comes in handy, in a number of ways, sealing leaking seams, making sap glue, coating small sticks for aid in starting wet, or damp wood, etc. Also include about four large heavy duty contractor grade trash bags. Can be used for rain coats, tied around the feet, for crossing streams, slit open, for water proof shelter, carrying water, and whole lot of other things. Not to mention using them for stuff you want to stay dry. I would keep the wool blanket, and socks, and add a wool shirt, light jacket, sweater, etc. and pants if you have them, being that even wet, they will keep you warm. Also add some small spoons to your fishing supply, and get some Pro line 25-30 pound fishing line, it is as small in diameter as 10-12 lb. mono filament, you can use it for a number of things like a new bow string, stitching, or sewing clothes, footwear, back pack, use it for snares, etc. Sounds more like a bug out bag, than a survival bag.
Wayne