Great gift idea for the hard to buy a gift for person. I have a flask that I use to keep full of water in the fridge so that I've always got cool water ready to drink. And the recent studies show that you want a metal flask, not a plastic one for reasons that were way beyond my understanding, but it was all scientific and you definitely want a metal one. These are 18/10 stainless, one holds a full 1 liter of liquid the other just half of that, twist off cap and even comes with a carrying case. STAINLESS STEEL FLASKS WITH CARRYING CASE DEAL