Efficient, Versatile Cook System Triple your cooking capability and efficiency with the Vargo Titanium Ti-Boiler. By pairing our popular titanium Ti-lite 900 ml Mug with a titanium 400 ml lid-pan we&&';;ve created a double boiler system that allows you to cook two items at once to save both time and fuel. The lid-pan is uniquely designed to nest on top of the mug to utilize the captured heat from the mug to cook food slowly preventing burning.