The double wall vacuum insulation technology, the Thermos Stainless Steel Non-Licensed Funtainer Food Jar keeps your lunch hot or cold food until you're ready to eat, 5 hours hot or 7 hours cold. In addition, it features an extra wide mouth that's easy to fill, eat from, and clean. Dimensions: 3.5-inch W x 3.5-inch D x 4.5-inch H.