Frozen bag, ice bag. It is a kind of packaging bag, which is used to keep food or other items in a low temperature state. Frozen bags are usually made of cold-resistant materials, which have good sealing performance and can prevent cold air from infiltrating into the bags. Ice packs are used to fill ice cubes or frozen gels to keep the temperature in the bags lower than the surrounding environment. These bags are used to transport or store items that need to be refrigerated, such as frozen food, medicines or biological samples.