The high grade vacuum flask is a sturdy, high-quality flask that's portable but still large enough for the thirstiest commuters. warm yourself up with a hot drink or soup – wherever you are! this master class stainless steel vacuum flask has a virtually unbreakable inner container, and keeps drinks and soups nice and hot for hours. this vacuum flask features an outer casing made from the strongest stainless steel. combined with its durable inner container, it creates an airtight seal that helps prevent heat from escaping. it's tough enough to withstand all manner of bumps and scrapes in a rucksack - whether you're hiking or commuting on a cold day