The cooling bag keeps the insulin cool. It consists of a cooling case and protecting case. Soak the cooling bag in cold water for 45-60 minutes. The special gel is evenly distributed and absorbs the water. Wring out the excess water or pat dry with a hand towel. Place the insulin pens in the poly bag supplied and then the cooling bag. The bag can then be placed in the corresponding protection case. It will remain at room temperature (15 °C - 25 °C, depending on the environmental temperature) for four days and can be reused multiple times. It can also be used for medicines that need to be kept cool.