If you can find three stout sticks, you can make your own camp stool. Tie them together around the middle with strong rope, but not too tight.
Now set up the stool like an "x" with the third leg of the stool crossing the "x" in the middle.
Sit on the "x" with the top of the third leg behind your back. Sit down cautiously. The stool will sink down low, but it should keep you dry on wet leaves. Any three stout sticks will do. You can even do this with three baseball bats at the next Little League game.
This idea is from Steven Caney's "Play Book."