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I did make a foam cozy from 5mm foam. It's ugly, but it works and it's just 0.2oz. I tried a beer cozy, which works just fine, but the one I have is really thick neoprene and weighs nearly as much as the cup. I did some surfing and there are silicone cup sleeves, but while searching on the silicon sleeves, I found all kinds of knitted ones. That made me think of *socks*, so I dove into the sock drawer, found an orphan and cut a 3.5" section off the ribbed top. That works great and it is about 0.2oz as well. It is cotton and will unravel with time, but it took 10 seconds to make. I'm thinking the cotton will be good for a pot grabber too. You could do the same with a spare sock from your pack, but you wouldn't be able to set it down.
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