Hot answers tagged ultralight
Yes, you can use an emergency blanket as a substitute for most of a tarp's uses, but as you suspect it's not going to be as durable. The Mylar that they're made of is surprisingly tough and I doubt that it would rip or tear, but I would expect it to develop plenty of very small punctures and begin to lose its aluminum coating (possibly making a glittery ...
You can in a pinch, but not what it is made for. Won't last very long at all and will make a ton of noise. Get a piece of Tyvek and cut it to size. Cheap, light and durable. Can't beat it.
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