I bought this flask because i thought it was good value for money for what it claimes to do.The flask is much better than i thought it would be, i filled it up with boiling hot coffee and about 9 hours later it was still pipeing hot! I also had some cold water in the fridge about 2.C and filled up the flask with it and about 24 hours later it was still nice and cold.The flask comes with 2 stoppers 1 for hot drinks which is completely sealed and 1 for cold drinks that if you push on it it opens and you can drink straight from it. The lid can also be used as a cup which is good because then you can use it to hold hot drinks to let them go a bit colder.
Overall a very good product 5 stars and works excellently!