I've used quite a few of these over the years. They are very travel friendly as all you need is a heat proof mug and hot water! The only difference between this one and others I've had is that it's a bit longer (longer than the photo they posted). It works if I put it diagonally in a medium sized coffee mug, but I think it might be too big for a small metal camping mug. Just something to know. But it works great!
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