A cooler bag is a portable insulated container designed to keep food and beverages cold. It is often made from durable materials like nylon or polyester and features insulation to maintain low temperatures. Cooler bags come in various sizes and styles, making them suitable for picnics, beach outings, or camping trips. These bags typically have a zippered closure and may include additional pockets for storing utensils or personal items. Some cooler bags are equipped with shoulder straps or handles for easy carrying. They are a convenient solution for transporting perishable items while on the go, ensuring freshness and safety.