The Pioneer Vacuum Food Flask is the ultimate, portable solution for keeping your soups, stews, and other hot foods warm for up to eight hours! Made of reflective 18/10 stainless steel with a thick outer casing and interior insulation, the flask has an airtight lid to prevent heat energy from escaping, keeping your meals warmer for longer. The flasks are also completely leakproof – simply screw the lid on tightly and it forms a string barrier to prevent your food (and heat!) from escaping – this makes it the ideal flask to store in a backpack or handbag, as the other contents of the bag will be protected from any accidents.