Rating: 2 / 5
I like the idea of a robust, double wall titanium mug that may be a bit heavier than a plastic mug, but is also much nicer to use. The Evernew ECA354 targets this, but a serious flaw with the lid and some other nitpicks means that it comes up short.
I'll cut right to the main flaw: The lid is made of a plastic that expands when it's hot, so astonishingly it fails to seal when you're drinking hot liquids. Fresh coffee pours right on your lap. As your drink cools, the lid fits better and finally once the drink is lukewarm it fits snugly and functions nicely. Pretty ridiculous for a product designed for drinking hot liquids.
Aside from that, the mug is decent. The only real complaint is that 1/4 lbs is an awful lot for a tiny little mug like this. It seems they've used quite robust titanium for both walls, when they could have used lighter titanium in the protected inside. If this mug was more in the 50-70g range it would be easier to justify carrying over a plastic mug or a single wall ti mug.
300ml is small, but a nice size for drinking Starbucks Via. It insulates well enough that I would normally finish my drink far before it cools, except the darn lid leaks like crazy at first so I have to let my drink cool off or not use the lid at first.