For this article, we’ve picked out several flasks that excel at insulation, leak-proofness, durability and, of course, value for money. The lid design allows you to unscrew it half way and achieve a controlled pour, perfect when decanting its contents into its accompanying lid. Key specs – Material: Stainless steel (not officially dishwasher-safe); Capacity: 470ml; Size: 22 x 6. The flask itself has a press-button top, meaning you press it in to pour your drink and then press it again to lock it. The best of the best are made from 18/8-grade steel (aka 304-grade), whose high nickel content makes it rust-proof and extremely durable.

It’s 100% leak proof – no matter how hard we tried, we couldn’t get any liquid to escape and the automatic opening trigger means you can drink from it one-handed with ease. uk/browse/sports-and-leisure/camping-and-caravanning/flasks/c:30512/brands:thermos/" on this server. Key specs – Material: 18/8 stainless steel with copper coating (dishwasher-safe); Capacity: 1l; Size: 23 x 12 x 11.Whether it’s a chunky “food flask”, sleek “vacuum bottle” or something in between, the job of a flask is to keep food and drink hot or cold without leaking, all day long. However, it doesn’t insulate for as long as the Stanley Master, and it’s a bit drippy when pouring from the spout, at least when it’s full.

While the temperature will drop a tad when ice begins to melt, we found that iceless liquids were the same temperature 28 hours later as they were when first added. This vacuum-insulated flask from Black+Blum is a highly distinctive and eco-friendly option for keeping your food nice and warm. Our recommendations below have managed to master the art and science of the vacuum flask – that ingenious, insulated container that does the job of a portable kettle or fridge without the need for a plug socket. And if you’re heading out there with a friend, even better, because there’s a second plastic ‘buddy cup’ hidden inside the larger metal one. The black styling of the Klean Coat matte finish is contrasted against the stainless steel of its inner screw lid.

Once sealed, it can keep food hot for up to six hours, while boiling water will stay piping for ten or more. If you’re after a single cup of tea, that won’t be an issue, but it’s worth considering if you’re planning to enjoy your drink over a few hours. For instance, the cup is insulated with plastic, so our tea retained its heat without being too hot to hold. A Thermos King will last years but it’s not officially dishwasher-safe, and you’re not even meant to submerge it in water (if you do, you kill the manufacturer’s 50-year guarantee). The stainless steel loop is a classy design addition for hooking onto your finger or clipping into a bag.

The steel is food-grade 18/8 so didn’t retain any smell or flavour from a tremendously strong cup of tea or coffee.At 360ml, it holds a decent-sized mugful and promises to keep drinks hot for four hours or cold for eight. We also love the classic Sigg handle, which doubles as a lever so you can open it using a stick if your hands are cold or dirty. While the 530ml version is suitable for single portions, those of you looking to share may want to opt for the more roomy 800ml option. Key specs – Material: 18/8 stainless steel (not officially dishwasher-safe); Capacity: 470ml; Size: 14.

The bottle has a wide-base design, so if you’re looking for a slimline flask to fit in a rucksack’s bottle carrier we’d suggest an alternative. It’s also non-magnetic, which may disappoint if you would hoped to adorn your Thermos with fridge magnets. Flasks come in a huge range of shapes, sizes and openings, and with varying claims as to how long they'll keep drinks hot or cold. It has a capacity of 400ml and its leak-proof twist lid ensures that food and drink stay put, wherever you go.Finally, there’s an additional loop handle on top so it can easily be attached to bags or simply carried this way.