I received the blue S'well 750 ml bottle as a gift. The bottle is beautifully finished, metal, sturdy and light weight. I read the claims on the packaging that said the bottle would keep stuff hot for 12 hours or cold for 24 hours. I was dubious so I put 3 cups of hot coffee in it and let it set for all day. When I checked it that evening, the coffee was still hot. I also tested the claims about keeping liquid cold for 24 hours an filled the bottle with chilled water. A day later the water was still cold. The real test was when I packed it with 24 ounces of crushed ice for a day. Twenty four hours later what happened? Sixteen ounces of ice and a few ounces of very cold water were in the bottle.
This bottle works amazing.