It's perfect for sharing and at 10 pounds for one of these flasks, a specialty at British coffee house Caravan.
But there's a crisis brewing in the coffee industry that is threatening the supply of premium beans.
And that could leave customers with a bitter taste.
Jeffrey Young is from coffee consultants Allegra Strategies.
"It takes four years for a plant to come on tap, four, five years for a coffee tree to turn into something you can actually roast."
