I bought a 12 oz and also ordered the sports cap. While I love it for its portability and that it doesn't sweat, I am kind of disappointed that the liquids don't stay as hot or cold as I like. I also own a
Sigg Thermal that keeps liquids cold up to 12 hours and hot up to 6. This product is amazing but the downside was that it leaked if you didn't screw the lid on right (also not as portable as HF).
I was hoping the HF would work just as well, but I dunno. I used it on two trips to NYC in the heat wave. Cold water with ice didn't stay cold past two hours, even if I put the flask in the hotel fridge the night before. Hot tea is more or less the same, gets lukewarm after 3 hours. The thing I liked about my Sigg Thermal was I could fill it with hot tea and have it available all day at work, and it usually lukewarm after 10 hours. Has anyone have the same experiences? I used both the sports cap and also the default cap that comes with it.