I have used just the ground or a closed cell foam pad. But, today I received the "Better Than a Rock" 12.6 oz stool. I plan to use it for backpacking as well as BP fishing adventures.

Update: I am returning this chair. It is well made but my arthritic body does land well when sitting down. I bought the 14" high version. Hindsight being 20/20, I might have been better with the 17" high version.