The Ninja Thirsti travel bottle really does work to keep beverages ice cold and carbonated all day! I love carbonated water but tend to sip throughout the day, and this really makes it last and taste fresh. The mint color is also very beautiful. My only knock is that for someone with small hands, the circumference of the bottle is just slightly too large to hold comfortably in one hand for too long. Anyone with average size hands shouldn’t have an issue.