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I have made them out of manilla folders (they last a lot longer than you would think if you lay them flat and dry them after observing), thin camping mats (don't know how you are supposed to sleep on them but they are light and make good shields) and a thin laminate like plastic I found in a hardware once (not sure what it is called, doh...).
I keep a cardboard one in my kit all the time so its there whenever I want it. Attach them with velcro and you are away.
Keep looking up.
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