Therm-a-rest closed cell foam pads, the non-inflating kind, such as the z-rest and ridge rest(folds and rolls, respectively) weigh almost nothing, are very durable, are reasonbly compact(though much more bulky than top of the line self inflating pads), and are not expensive at all. As a bonus, you can circle either one around your stove in cold weather, to save fuel and decrease cooking time. Of the two, the ridge rest is cheaper and more durable, since the z-rest is very thin where it folds.