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H-has no one suggested a pourover yet? Just get a metal or plastic pourover cone and you can stick it on top of your thermos/nalgene/mug. Just put cone filters in it, put ground coffee, pour just-off-the-boil water over it and you'll have coffee in like 2 minutes.
You can get a cheap plastic pourover cone for like 5 bucks. You won't even notice the weight of a plastic one.