At a glance, this mug might look like your everyday drinking vessel, but look again. It’s loaded with top-to-bottom insulation to keep your coffee hot from the first pour to the last sip. And it’s a space saver. When the lid is removed, the built-in grooves on the bottom help it stack perfectly on top of another one just like it. So whether you’re storing it in the cabinets or packing it up for an adventure — it one-ups the average mug.