Abstract: A portable temperature changing apparatus for containers includes a cylindrical annular moisture-proof pouch divided into a first compartment filled with a liquid and a second separate compartment holding a solid material capable of producing an endothermic or exothermic reaction upon mixing with the liquid. The seal separating the two separate compartments can be ruptured partially, when desired, enabling communication of the liquid with the solid to activate the temperature altering reaction. A flexible foam insulating layer surrounds the exterior of the annular cylindrical pouch providing insulation, damage protection, and labeling.