Heat Pack 40-72H is a specialized product designed to provide consistent, controlled warmth for the safe transportation of temperature-sensitive goods over a period of 40 to 72 hours. This type of heat pack is particularly crucial in the shipping of perishable items like live plants, animals, food products, and pharmaceuticals, especially during colder months or when transporting goods through cooler climates. Utilizing a chemical reaction, often involving the oxidation of iron when exposed to air, these packs maintain a steady temperature range to ensure the well-being and integrity of the products in transit. Heat Pack 40-72H is designed to be easy to activate and place within packaging, offering a reliable and efficient solution to maintain optimal temperatures.