Great thermos flask! I did a leak test upon receipt and even after being upside down for a day there were no leaks at all. Did a full ice water test and with an outside temperature of 80 degrees I got 2 full days of ice. I use mine for water and sometimes sports drinks and it works great for that purpose. I can't say this works or is recommended for carbonated or carbonated drinks based on how the mouth seal works and design. I would be concerned that pressurization could deform or damage the seal in some way. The gasket looks like strong silicone, but it doesn't look like a replacement part, nor does the lid. This seems normal with hot liquids, just be careful how hard you press the button to avoid slinging out too much hot liquid. . I use mine for cold drinks and a more traditional flip top mug for hot drinks where it's much easier to drink. The design of this bottle is great for drinking water but doesn't make it easy due to the mouthpiece that you have to seal your lips on and the bottle's backward tilt.
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