My current hanging setup involves using a Big Agnes bag with a Thermarest Prolite pad through the back. It works pretty well, but over the next year or so I'm thinking of saving up for an topquilt and underquilt to make things even more comfortable and lightweight, since I am interested in doing more hiking, and have bad knees.
My question for the veteran lightweight hikers: What, if anything do you carry as "Going-to-ground Insurance" in case of inadequate hanging, specifically for bottom insulation?
I'm using a Clark Mark 2, which effectively comes with its own groundsheet, and until now the Thermarest doubled as my backup ground insulation. I was thinking that bringing a lightweight space blanket in my kit might do the trick -- lay it out flat on the inside of the Mark 2, then double up the underquilt on top of the space blanket, and lay on that with my topquilt.
I know I can always just carry the Thermarest as a backup plan, but it's a pound and a half, so if I could cut that weight altogether my knees would be a lot happier.
Thoughts?
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