What is another word for thermos flask?
Pronunciation: [θˈɜːməs flˈask] (IPA) 
A thermos flask is also known as an insulated flask, vacuum flask, or a double-walled flask. Other synonyms include a heat-retaining container, a thermal bottle, or a hot-cold flask. The term thermos is actually a brand name, but it has become so widely used that it has become a common noun. No matter what you call it, a thermos flask is a useful item to have in your home or office. It's perfect for keeping drinks hot or cold for long periods of time, making it a great accessory for outdoor activities like hiking, camping, or even just a day at the beach.
