Someone may have posted this before, but I had never seen it on here.
So anyways, today I got some homebrew supplies in the mail, and they came wrapped in this dark grey bubblewrap stuff. I had tried bubblewrap backpacking pads in the past, and hated how easily they popped, and having them burst in the middle of the night on me.
This bubblewrap was different though, with all of my weight on one foot, it would still not pop.
I cut it to the length of my Ridgerest, and taped the two pieces together with some tape. Laying down on it for a few minutes felt comfortable. I put it on my scale and the two pieces taped together weighed 2.1oz. If I was ever going to put this to use, I would sew a nylon sleeve for it, adding aprox. .5oz, so a finished product weight of ~2.6oz could be possible with this setup.
Heres some pics of the stuff I am talking about