Cooler bag is an insulated bag used to keep food and beverages cold (or hot) for long periods of time. It is made of warm materials such as foam insulation and a waterproof lining, which helps maintain the temperature inside the bag.

Cooler bags are commonly used for picnics, camping, beach vacations, road trips, shopping, or outdoor activities. They are ideal for transporting perishable items such as sandwiches, fruit, beverages or dairy products. Many cooler bags come with zippered compartments, carrying handles and shoulder straps for easy portability.

They are a portable and convenient way to keep items fresh and safe, especially if refrigeration is not available.