Contigo Stainless Steel Travel Mug: These are easily the best travel mugs I've used to date. They keep the drink either hot or cold depending on what you need out of it. A lot of travel mugs I've used in the past will lose their thermal capabilities within the first few months as the internal vacuum slowly becomes pressurized. My current set of Contigos has lasted well over 2 years so far with no signs of slowing. Another great feature is their lid - it's completely water-tight and has a push button on the side that opens a small slit for you to drink from. This means that you can easily move it around without fear of it spilling. I got mine at Costco, but you can get them on Amazon for those of you without a nearby Costco. Pretty sure I've seen them at just about all major retailers.