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Old Feb 1, 2018, 6:46 pm
  #8  
chrisl137
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Join Date: Nov 2013
Location: Los Angeles
Posts: 12,550
I recently flew with a stainless steel tea kettle in my carry on. They didn't even look in the bag. The kettle was empty, and it's single-wall rather than the double-wall that you probably have with the mug, but I suspect you'll have no problems.
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