With its patented microwave activated Heatkeeper technology, The Stanley 17oz Heatkeeper Food Jar will keep food hot 4-6 hours after microwaving. The ultimate in portability, the durable Stanley 17oz Heatkeeper features double-wall unbreakable foam insulation and an easy-to-grab handle. Every Stanley® is backed by a lifetime guarantee. In 1913, William Stanley invented the all-steel vacuum bottle. Since then, the Stanley bottle hasn't missed a day of work, a football game, or a trip to the great outdoors. The distinctive Stanley® bottle is an American Icon that still works as hard today as it did nearly 100 years ago. Stanley... Built for Life. Includes bonus spoon that folds in half and can be stored in the lid.