Amazing Bottles. I purchased 2, a 500ml for hot drinks and a 750ml for cold drinks, mostly for the gym and work. I find myself using them everywhere, all the time they are that good. They are attractive, stylish and simple to use, easy to clean (I have had no issues with bad smells, which you get with some flasks). They 100% do what the adverts say they do. I work a 10 hour shift, I can take a hot drink with me and it is still hot when I finish shift, although it doesn't tend to last that long. The facts is stays cold for so long is ideal on summer days and for the gym. I am in love with these bottles and will be looking to purchase more.