While on vacation in Kansas City I purchased on of these bottles at a Moosejaw store. I got it for making HOT tea so it was a good thing I didn't see the (NOT FOR HOT BEVERAGES) note in the instructions. It works great! After making my tea I swirl the bottle and press the button to vent pressure. I do this a few times till no more pressure vents. I have had only slight seepage at the top seals. Press the button and we're good to go. I have a 25 minute commute to work. By the time I get there I have a perfect cup of HOT tea. Even two hours later it's still very warm. It works the same for cold tea also.Love it so much I'm buying another! My only request would be a larger bottle mouth so I could use larger tea balls.