In our search for a good travel mug, we tested ceramic, glass, steel, double- and single-walled designs, and found that this tumbler from Grosche had the best heat retention of them all. It also has a good seal between the silicone lid and glass, and the glass itself, while not unbreakable is pretty damn tough. Sure, it lacks the complete fake-takeaway-cup look, but it will fit in your cupholder. We currently carry them in both 12 and 15 ounce sizes, $11.50 and $14 respectively. They also look great with our reusable sleeves. We also have a small supply of French presses from the same glass maker.