It fits in cup holders, it keeps drinks insulated for hours ... Case in point: This is the ideal iced or hot drink container for the car. Stainless steel is an effective material for insulating ...

Above: The first version we spotted? The indestructible Insulated Stainless Steel Coffee Cup and Saucer , which keeps “any coffee, cocoa, or cuppa hot all morning.” It’s $45 from Garrett Wade.

These vessels usually use two stainless steel walls with a vacuum ... environment determines how quickly your drink cools off. Similarly, insulated cups are only useful if you keep the lid on!

There are plenty of travel mugs to choose from out there—from the cheap plastic kind sold at your corner convenience store to ...