You can (and should) invest in great coffee beans, store them in an airtight container, and brew them with the best gear around. But pouring that elixir into a cheap travel mug is a great way to waste all of that money and effort. Bad mugs don’t keep hot coffee hot or cold coffee cold, leaving you with lukewarm swill. Oh, and they leak. The only thing worse than drinking bad coffee is not even having bad coffee to drink because most of it ended up on your shirt. But deciding to ditch that free mug you got for donating to NPR ten years ago is the easy part. Finding a worthy replacement, with so many brands, features, and price points available, is difficult.