The UniHeat 72 Hr Shipping Warmer Heat Pack Bulk contains 9 pieces of heat packs that are designed to provide consistent heat for up to 72 hours. This product is specifically intended for use in shipping live fish, plants, or other temperature-sensitive items to help maintain the appropriate temperature during transit. With an expiration date of December 28, 2026, these heat packs are reliable and efficient for ensuring the safe transport of goods. Ideal for aquarium enthusiasts and pet owners, the UniHeat 72 Hr Shipping Warmer Heat Pack Bulk offers a convenient solution for maintaining warmth during shipping.