g. one walker carries lunch, another carries the picnic blanket etc) then overall you will use less space than if you each carried smaller flasks. c / Made from 18/8 Stainless Steel / Lifetime guarantee / BPA Free and EU safety tested / Over 10% SHO profits donated to charity.

Out of sheer curiosity, we also filled it with ice over a weekend and discovered minimal melt at the end of it. It is definitely more space efficient to use one big flask for the group rather than several small, individual flasks. Our test unit was the ‘wide mouth’ variety which enables you to take a decent glug of the contents and offers quick pouring.

You might think that the easiest way to get your hot drink fix is to carry a gas stove and camping kettle up to the summit in your rucksack.

The hordes of 5-star reviews more than outweigh the small number of unhappy owners – we like the Oneisall and can recommend it based on our experience. However, you’ll have to timeshare the cups if there’s more than two of you, or bring along a couple of extra lightweight mugs. c / Made from 18/8 stainless steel / Leak-proof / Insulated lid doubles as a cup / Dishwasher safe / Lifetime warranty. The only design drawback is the flask’s narrow neck and mouth, which minimises heat loss but makes cleaning a little tricky.

We have personally used these items and have tried to provide honest and authentic reviews based on our experience.