16-Ounce Vacuum Insulated Tumbler by Klean Kanteen.
Stainless Steel. Vacuum Insulated. Vacuum insulation keeps your beer (or other beverage – what… other beverage?) cold. Also resists condensation and sweating.
Update: Since this post was published the price, availability or promotion has changed. Check the product page for current description, price and availability. Also: Today’s Deals on Amazon