Cauldryn: the temperature controlled mug that can even boil water from a battery.
This is a great idea for camping hiking fishing or anywhere you need to boil water.
Select your Favorite Temperature for your Coffee or Tea
Boil Water from Battery Power
All Day Power
Charge your Devices
Brew your Favorite Hot Beverage
High rating on this product. I found this while looking for a portable espresso maker.
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Speaking of the espresso maker. I am thinking about going with this one.
http://amzn.to/2COvWQg
just in case anyone was curious.