I’ve had one of these for just over a month now and following a recent heat wave, I’m impressed.
My job keeps me on the road most of the day, and I like to have something cold to drink in the car between jobs. During the summer months a bottle of water left in the car doesn’t stay cold for long, which means either drinking hot water or buying bottled water from a nearby store.
I normally fill the bottle just before I leave home in the morning, and towards the end of a 40c+ day the water is still cold, even when the bottle has been left on a car seat in the sun and is almost too hot to pick up! The large capacity means there’s enough water to get me through the workday.