Delayed the review so that it could be tested, really good flask. Keeps cold drinks cold for at least 6 hours and hot drinks drinkable around 5 I would say. Good choice of 3 caps. I did find that the clickable closing lid did not seal all the time when lying down and would leak a little but I am not sure they are designed to lay flat with type of closing system. The screw down lid certainly seals well with a handy carrying loop. Being in use for at least 6 months now and going strong. Outer finish is wearing well with no signs of use really. Bit more expensive but well worth it. Would recommend.