I love this bottle. I love the ergonomic handle while drinking or carrying and it fits in my fingers great. The main pull is does it keep cold and stay fizzy? Somewhat and yes! I made myself a bottle at 18 ounces at the first stage of bubbles and maybe drank 6 ounces before I left it out accidentally around 8 PM. When I noticed I left it full the next day around 9 AM it was STILL fizzy but not very cold. But I just stuck some more ice in there and continued. Great job!