Not only do these keep hot and cold liquids hotter and colder a lot longer than ordinary plastic or Nalgene bottles, they’re also portable Buddhist temple gongs. Flat tire? Unforeseen crappy weather? *@!#&%! minivan owners!? No matter what the calamity or where you may be, just gently tap one of these incredibly resonant bottles on any hard surface and you’ll be instantly transported to a state of heightened relaxation. Blood pressure… lowering. Urge to maim…decreasing. Impending myocardial infarction… gone. Ahhh… The effect is a lot like the Incredible Hulk, only in reverse. Double-walled, vacuum-sealed stainless steel with leak-proof lid and a carabiner clip. Calming effects increase with potency of libation. Safely carries 30º-206º potables. Sharp looking, too. 15 oz. (.44 L) is 10"×2.8", 19 oz. (.56 L) is 11"×3".