Simple and inexpensive. I have a self inflating sleeping pad. But it slips and slides under me when I hammock camp. Using one of my old mil surp pads, I made a decent and useful replacement until I can get a nice under quilt to go with my sleep system. The mil surp pad is somewhat bulky. Considering how little it weighs and that it does a good job of preventing your bag from sliding. It’s not a bad trade off.
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