Treat guests to a pot of piping hot tea coffee or soup with this superb 3 litre flask what a great solution for serving a group of people the vonshef air flask is perfect for keeping beverages hot ndash or cold ndash and is big enough to serve dozens of drinks from one filling using it is simplicity itself just top up with the liquid of your choice seal it up and let everyone help themselves the stainless steel double wall construction means it will keep your drinks at the right temp