A small piece of foam from a sleeping pad makes a fantastic sit pad. You're doubting the usefulness of a sit pad as you're reading this, but when I cut ounces for ultralight camping, I still bring my Thermarest z-lite sit pad. It's one of my favorite pieces of gear. A sit pad lets you change socks without getting dirty, gives you a nice place to eat your lunch, works great as a pillow, and makes a great conversational piece. Try it out!