The name of the water filled ice bag comes from the need for water injection before use. After water injection, the water reacts with the content to become an extremely strong cold storage product. Its contents are generally referred to as ice crystals. The water injection ice bag adopts a reverse water outlet control to prevent leakage after water injection. 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.