A chemical thermal pack is provided having a flexible liquid impermeable pouch, an endothermic/exothermic producing chemical, and a liquid permeable pouch. The flexible liquid impermeable pouch has a resealable closure edge and a scored tamper seal. There is one of an endothermic and an exothermic producing chemical. The liquid permeable pouch is contained within the liquid impermeable pouch and provides a cavity for containing the endothermic/exothermic producing chemical. A user breaches the scored tamper seal and inserts a fluid solvent within the liquid impermeable pouch and reseals the closure edge. The solvent is reactive with the chemical to impart one of an exothermic reaction and an endothermic reaction. A method is also provided.
