Self absorbing ice bags are soaked in water, then gently rubbed with your hand for a short while to quickly expand. After expansion, they are taken out, and then frozen in a refrigerator or freezer. Once frozen, they can be used. Suitable for cold and fresh transportation of aquatic products, sea insects, seafood, meat, dairy products, beverages, vaccines, reagents, household products, flowers, solder paste, etc. Generally, it is used together with foam boxes or special cold chain boxes to achieve the effect of refrigerated transportation.