Top critical review
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I cannot recommend this product and would advise potential buyers to look elsewhere for a vacuum flask.
on 10 September 2015
The ratio between price and performance is vastly unmatched. First I'll discuss the physical properties of the flask. The lid/cup is solid and does not bend, it is made from durable plastic and coated with a rubberised plastic for grip in certain places. The coating scratches very easily and leaves white marks which started to appear all over and very soon after using it. The stopper, this is by far the worst part of the flask, it has virtually no grip, is too slim and must be tightened very securely to function as a vacuum flask. Because of the almost non-existent grip, tightening and loosening the stopper is an arduous and frustrating task. The body of the flask was slightly misshapen, it was almost cylindrical and smooth but certain areas felt compressed or expanded when holding it in my hand.
Now I'll talk about the thermal performance. As stated on the manufacturer's website, it should keep hot drinks hot for 24 hours. It does not. I was lucky to get 12 hours if I made sure the stopper was so tight that I almost broke a sweat trying to make it so. On average I had about 10 hours of temperature retention until the drink started to become mildly warm. When pouring in my coffee and adding a splash of warm milk, the drink was too hot to sip, but opening it about 10 hours later it would be warm enough to reasonably enjoy, but too cold to be called hot, and that's only if I didn't open it in between. If I filled it up to the brim and had several cups from it during the day, it would only remain hot for about 6 hours, after which I could notice a distinct drop in temperature and made me question whether or not to drink it. And of course, opening the flask several times within a 6 hour period caused my hand to become quite sore because of the ridiculously bad stopper.
I also tried another vacuum flask from the same brand, Thermos, but from a different product line to see if I could get better results. I opted for a "Light & Compact" flask from Thermos, and overall the experience was not as bad as this, but I still came away disappointed and I will never be going back to the Thermos brand again.
I cannot recommend this product in any way and would advise everyone to look elsewhere for a vacuum flask.