Insulation: The flask is advertised for "long-term insulation," with some models claiming to keep liquids hot or cold for up to 60 to 72 hours.
Material: It is constructed from 304 stainless steel, which is food-safe and corrosion-resistant.
Capacity Options: Common available sizes include 3-liter and 4-liter capacities.
Design: It includes a sturdy side handle for easy carrying and a screw-on lid that typically doubles as a drinking cup.