ThermoCafé Stainless Steel Flask, Multi-colour, 1.0 L

Product Information

Stylish, eco-friendly bamboo lid / Grab handle / Bottle + packaging 100% recyclable / No plastic comes in contact with your drink (silicone seal only) / BPA-free / Hand wash only. The inner layer is unusually coated with copper (not in contact with your drinks though) and this feature actually reflects the heat energy back into the liquid effectively. Like the GSI Microlight, the stainless steel outer wall is necessarily thin and will dent more easily than others. The main aim of any vacuum flask is to prevent heat loss by either conduction, convection or radiation.

To test the heat-holding power of the flasks, we firstly primed each one for five minutes by filling them with boiling water.

The other critical feature is a secure cap, so that even if your flask gets knocked around or accidentally up-ended in a rucksack it won’t leak. c / Durable 18/8 Pro-Grade Stainless Steel construction / Wide Mouth for easy drinking, filling and cleaning / BPA-Free and Phthalate-Free / Dishwasher safe / Lifetime warranty. The mouth of the flask is relatively narrow, which probably helps to keep heat in but makes filling and cleaning a little tricky. We also filled the flasks or cups with boiled water and then used that water to make a cup of tea for our 'tea test', and scored it out of ten based on how hot the resulting drink was.

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 Milu offers decent quality materials and the strong housing mechanism makes it durable and comfortable to use in the outdoors without fear of breakages. The lid of the Smardy is 100% leakproof and non-toxic and can act as a small cup, but isn’t the biggest on offer in this roundup. Our test unit was the ‘wide mouth’ variety which enables you to take a decent glug of the contents and offers quick pouring.

To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Don't leave food and drink in a flask for a long period of time Bacteria can breed and this produces gas. c / 2mm walls result in a compact footprint that fits anywhere / Made from 18/8 stainless steel / Push-button, flip top cap locks closed for transport and locks open for easy drinking. Not having to remove the full cap reduces the amount of heat that escapes when using it, so liquids stay hot for longer.

We placed the flasks outside on a level surface and reopened them after 90 minutes, 4 hours, 6 hours and 8 hours, taking the water temperature at each interval. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others.In addition, many larger flasks incorporate ‘twist and pour’ spouts, so you can pour from the flask without having to completely remove the stopper.

We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.If you’re after a large flask, the Oneisall 2L is a great stainless steel option with a lovely ergonomic design. This is one of those brand names that have become descriptive of the product itself – a bit like Hoover being synonymous with ‘vacuum cleaner’. The Smardy flask is manufactured with high-quality stainless steel that makes it extremely durable and we are confident it will perform well over the long-term. However, the efficiency of this insulated flask and its brushed stainless steel styling makes it one of our favourites. We then refilled them with water at 90°c to simulate the temperature of hot coffee and fitted the screw tops and cups.