I carry a plastic sleeve that might hold a magazine. It's made of the same material and thickness as a contractor bag. When resting on the trail, I put it on the ground and sit on it, especially on damp days. In camp I am likely to fill it with kindling or anything else that needs keepig dry.
Also I carry 4 chopsticks. There is a particular design that works well as a tent stake...eat with them or use as kindling.