What you need to go in top of all that is a self inflating sleeping pad. They have inner structure and open cell foam.
I wonder which came first, these mats or the self inflating whoopee cushion?
A truly brilliant idea to take the original fart device and fill it with open cell foam so it provides repeat action instead of having to blow it up after each victim.
To deflate and roll into a very small package, open the valve then roll up tight to force out air, then close the valve.
To inflate, open the valve and unroll. Give it a bit of time to spring up then puff in a bit of air and close the valve.
I picked up an REI Sit Pad at a thrift store for under $5 USD. It's pretty nice, easy to adjust the firmness. If I blow in to fully inflate then let off before closing the valve it's a squishy pad. If I hold pressure while closing the valve it's quite firm.
If I was one to go camping I'd definitely want one of their sleeping mats, or a less $$$ one from Coleman or some other company.