Stainless Steel Thermal Food Flask 2 x 500cc. 4m+ Keeps food hot or cold for up to 10 hours due to the insulation of the double wall vacuum. Light, practical and safe, ideal for using at home and when you’re out and about. We recommend you fill the flask with boiling water for 5 minutes to heat the flask walls up first. This will ensure the food stays hot for longer. It has a double closing system. The first smaller lid is sealed with silicone to prevent liquid from leaking out. The outer lid is bigger and can be used as a bowl making it easier to feed the child and leaving the rest of the food inside the flask so it stays hot. It has a nylon carrying bag making it very convenient on journeys.