ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,396,546, issued on Aug. 26.
"Backpack with heating and cooling elements" was invented by Dimitri Vollmer (Lakewood, Wash.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A heating and cooling backpack apparatus for storing baseball bats and selectively heating and cooling parts of the bag includes a body having an outer shell which defines an interior space. A carrying strap is coupled to a back side of the body and a bat sleeve is coupled to the body for holding a baseball bat or similar sports equipment. A bat heater selectively heats the bat sleeve, and a back heater cooler selectively heats and selectively cools an outer surface of the body across th...