1. In the field, on the way to travel and other places, it is used for freezing or heat preservation of beer and beverages, with a lasting effect of up to several hours. 2.It can be reused for countless times. 3.It remains soft after freezing. 4.It is easy to carry, simple to use, safe and reliable.Chilled, heated beer, red wine, champagne, drinks, etcopp bag + color card, card head + opp bag, color box1.Refrigeration: place the product in the freezer or refrigerator freezer (- 18 ℃) and precooling for more than one hour. 2.Heating: heat in microwave oven for one minute or boil in boiling water for 5 minutes.This product is only suitable for external use. If the package is accidentally damaged so that the liquid in it touches eyes or skin, wash it with clean water. Storage:Keep in a cool and dry place or refrigerate in the refrigerator to prevent ultraviolet radiation.