Hi
Like Rick,
I have no problemo with my ti cup. As rick points out - sort of - ti is not that good of a conductor. Now to really get hot lips, use a thick stainless steel cup. However plastic works well, is durable and a good insulator. I have a thin neoprene "COKE" jacket around it. Often though I heat my water in my .6Liter ti pan, stir in my coffee and drink from the pan.
Jim YMMV crazy
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.