Stanley's thermoses have long been reliable partners for outdoorsmen, workers, and anyone else looking to keep liquids hot or cold for extended periods. The Stanley Master Vacuum Bottle builds on this tradition with QuadVac insulation that's the company's most efficient yet. The bottle itself is made from sturdy 1.0mm 18/8 stainless steel, with a steel-lined pour through stopper, steel handle with a silicone grip, and a vacuum insulated 18/8 stainless steel cup. It's the QuadVac insulation that's the real star, however, keeping the contents hot for up to 40 hours, cold for up to 35, or iced for 160 hours, enough to last an extended weekend trip. Available in 1.4 qt and 25 oz. capacities.