The SHO promises to keep your food hot for 10 hours or cool for 20 and it lived up to its promise for us. For hot food, it was noticeably cooler after 10 hours but still hot enough to eat without reheating. Thermos is the most well-known brand for making insulated flasks so they’ve got it down to a fine art. The leak-proof design also promises to keep your food hot for up to six hours or cold for up to eight. However, the silky smooth stainless steel finish made tightening and loosening the lid much harder. On the plus side, this made cleaning it super easy - handy as it can’t go in the dishwasher.

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There’s no inner lid or cutlery with this one, nor does it promise to keep your food warm or cold for a specific amount of time. Because of this, we decided to go with a minimum keep-warm period of 6 hours. Our fantastic customers are the most important part of our business and we guarantee we'll be there for you during your journey with us. Of course, one of the main reasons to buy a flask is to keep hot food hot. As such, heat retention is another of the most important factors to consider before buying. This heat retention time can vary hugely between around 4 hours, up to 12 hours and potentially even longer than that. This means that you have to factor in how, where and when you intend to use your flask. For single portions, a few hours is probably fine, but on longer expeditions with multiple meals, you’re naturally going to need one that’ll hold onto that heat for longer. The ones that will keep your food warm for longer will generally cost more, but they can also be more versatile.What we particularly liked about this one was the range of colours it’s available in, meaning it’s easy to get a shade you like. The cylindrical jar has a wide base with a lid that’s coated in a grippy material that makes it much easier to unscrew. Food flasks vary in price depending on how big they are and how long they will keep your food warm. INSULATED food flasks are perfect for hiking trips where you don’t have anywhere to heat up your meals but they can also be great for the office or school.

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We also had to wrap the spoon to make sure it stayed clean before use as it’s on the outside of the flask rather than the inside. For kids, there are smaller capacity ones of around 300ml. These don’t weigh as much, will fit into lunch boxes and, as kids generally eat less, there’s nothing going to waste. You get a foldable spoon with this food flask, which is stored on top of the inner lid. The inner lid also features a secret compartment just below the spoon, which can be used for storing salt and pepper if needed.

What to look for in an insulated food flask

On a budget – The 720°DGREE wunderJar Food Flask makes for surprisingly good value for those not wanting to overspend on a food flask. Even with its environmentally-friendly credentials, which often come with a little extra on the price tag, this particular flask is very reasonably-priced for a flask with a solid amount of volume for single portions and exceptional build quality and style. We don’t think it’s a huge problem but obviously it depends on how long you’d need to keep your food warm. For a camping trip where you might not eat for hours, it’s not ideal but for the office, the keep-warm time should be sufficient.