Depending on the size of your blanket, a good sleeping bag (such as a down or synthetic filled, 30 degree, mummy) will take up less space, and weigh less than any wool blanket that is thick enough for camping during an Oregon autumn- early winter. Also, depending on the quality of your shelter, you may want to add a Goretex bivy cover to your sleeping arrangements. In the wet, it will add extra protection to the sleeping bag, and help trap a bit more air for insulation.