IRON FLASK!!! I used HydroFlask for years. It works great. HOWEVER... When I left mine in a hotel last year, I tried this one from Amazon:

https://smile.amazon.com/gp/product/B07XBHLP9T/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

It is just as good as HydroFlask when it comes to keeping things cold for a long time. As in, 24+ hours with ice - no joke. But they have better colors to choose from (IMO), more sizes to choose from (you can even get a 64oz), wayyyy more affordable, AND they come with 3 different type lids at no extra cost!! With HydroFlask, you have to buy extra lids. I highly recommend IronFlask for those who want a copycat HydroFlask at a better cost with more lids. They are truly the exact same quality with different colors and sizes for half the cost.