It doesn't fit my car's cup holder. It seems Ember forgot why they shaped the Travel Mug the way they did. The sipping lid leaks. The screw on lid doesn't leak but I don't have a use for a lid you can't drink from (I doubt people will be carrying and swapping the lids while on the go). It'd be great if I can charge it via USB-C somehow. Maybe a "travel" coaster with a USB-C port. In the end, the Ember Tumbler has become just a mug that never leaves the house.