Composed primarily of stainless steel and also vacuum-insulated, it has a markedly wide mouth, so I’d say it’s one of the most versatile flasks I tried in terms of storing both liquids and thicker soups and stews. You may not have heard of ‘BPA’, but in a similar way to aluminium in camping kettles, it should be avoided when you’re looking for a thermos flask. Available in a range of colours (we like the electric blue), the flask is highly suitable for camping trips and general travelling refreshments. 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. This Thermos Café by Thermos flask is less efficient at keeping the heat in, though not as bulky as the Thermos Mondial flask featured above.

MILTON Beverage Dispenser 3.09 L Flask - Flipkart MILTON Beverage Dispenser 3.09 L Flask - Flipkart

But unlike most other flasks featured here, the screw-in loop cap incorporates a locking, flip-top lid for one-handed drinking. The two glass-lined flasks we tested were the only flasks to fail our drop test: one shattered on the first drop, the other fell apart on the second.If all these routes out are blocked then the heat will stay in – I remember that much from my physics degree! The wide mouth means it’s also suitable for soups and smoothies to take to work, and it will certainly keep them either sufficiently cold or hot until lunchtime.

Thermos Flasks | Hydro Flasks | Millets

Tough enough for every adventure, our water bottles are leak-proof and durable, making them perfect for drinks on the go. Need to know: Dishwasher safe, twist-off lid, available in a range of colours, no cup, also available in 532ml, 596ml and 946ml sizes, lifetime warranty Jack Wolfskin Kolima 1. After Stanley, I found the Thermos – a brand which has become synonymous with insulated flasks – to come a close second in terms of heat retention.When single-use plastics started getting a bad rap, S’well became the drinks bottle of choice for a host of celebrities and ‘influencers’. Starting with hot water at 95 ℃, you can expect it to drop to around 60 ℃ after 12 hours, 51 ℃ after 24 hours and 40 ℃ after 36 hours.

Flask with Vacuum Insulated, Safety 3L/5L Pump Action Air Pot Flask with Vacuum Insulated, Safety

Once you have one in your life, you'll find it accompanies you to the office, to festivals, on camping trips, and even on holidays abroad. It’s just a shame that the capacity is a bit small, and it’s relatively expensive for a little flask.

In terms of outright heat-holding performance for up to 8 hours, nothing can touch the Ultimate Series. c / Wide mouth for stirring coffee or adding ice cubes / Made from 18/8, food-grade stainless steel / Condensation-free exterior / BPA- and BPS-free / Hand-wash only.