Recently my daughter came home from school saying her Hydro Flask no longer kept her drink cold. So I wanted to test it and determine once and for all whether or not it was broken.
If you've got the same issue here's how you can work out whether or not your Hydro Flask is broken using nothing but a jug of boiling water and your hand.
![](https://s2.save4k.ru/pic/bskBa_Y65PY/maxresdefault.jpg)