Capacity: The bigger the bottle, the larger the payload – but you won’t need a litre if the liquid’s just for you. 500ml is plenty for your favourite infusion, while 800ml is the Goldilocks option for ...

Best for function and form: Thermos Stainless King Food Flask, 470ml - £25.08, Amazon Best for long-term temperature maintenance: S’well Stainless Steel Traveler - £21.37, Amazon ...

This little flask is perfect in size.' If you need something a little bigger, however, then the flask also comes in a 500ml and 1-litre size that are both currently on sale too.

There's a storm in a teacup brewing at Wimbledon: British tennis-lovers have been told not to bring Thermos flasks of tea to the All England Club. A set of picnic items, including a thermos flask ...