freezer pack
noun [ C ] uk/ˈfriː.zə ˌpæk/ us/ˈfriː.zɚ ˌpæk/
（内装水或其他可冷冻液体的）冷却袋
a plastic container filled with water or other liquid that can be frozen and then put in a container holding food and drink, in order to keep the food and drink cold