the piece of tyvek (a construction dumpster find) that I carry is about 2'x4'. It's just big enough to lay on if I have to. Otherwise it's used under my hammock for backpack, shoes and a clean dry place to swing my feet to, when getting in and out of the hammock. I keep it on the outside of my backpack so when stopping for lunch, I can use it for a clean place to sit and eat. It's also large enough to cover my gear that's under me if I need to use it that way. When new it's very crinkly but as you use it, it gets softer and quiter.
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