Before purchasing the Caldera Cone system for the Alpkit MyTiMug, please study the two pictures below to ensure it will fit. Alpkit originally produced a versions of the MyTiMug that was dimensionally similar to the SnowPeak 700 and Vargo TiLite. In late 2008, Alpkit changed vendors and pot size but kept the MyTiMug name. The later version is dimensionally similar to the Ti-Goat, Brasslite, and Backcountry.com 700ml titanium mug and will require a different size cone.
The way you can tell which pot you have is: