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I commute on the train each day and leave for work quite early. I do not have time to have a cup of tea before I leave so always like to take one to drink on the train to wake me up. Having tried many cheap thermos mugs, I was always disappointed with the quality. They leaked, didn't keep the drink warm or were too fiddly to wash. My husband bought me a red lifeventure thermal flask to stop my complaining and it has been excellent.
The flask is 16 cm high and has a separate twist off cap where salt, pepper or sugar can be stored. It is made of stainless steel with a rubber seal. It has vacuum insulated walls and a pressure release chamber. It comes in a range of bright metallic colours.
It never leaks and is easy and quick to wash. Its thermal properties are excellent. In fact they are a little too good for me. I make a cup of tea for my train journey and I am half way to work before it has cooled down enough for me to drink even with the lid off for half an hour! However, I also use this flask for taking milk to work to use for cereal and cups of tea during the day. It keeps the milk cold all day which is perfect. My other criticism of many other metal cups/flasks is the horrid taste they leave in your mouth. I don't know why, but this one does not do this.
The flask is a very handy size (300 ml capacity) -just right for a large mug of tea or soup and fits into my handbag to carry around. Lifeventure flasks cost around £11 and can be bought from most outdoor type shops such as Cotswolds or Blacks. Although they are a little more expensive than some other options, the quality is excellent and worth the extra cost.