Elaborate and superior Ice Bags for assistance in shipping temperature sensitive products. They are made of a specific macromolecule substance, which becomes water-like after hydration and packaged in a cold-held bag. It can be used in food keeping, medical treatment, heat insulation and temperature reduction, refrigerator energy-saving, travel, field working and heatstroke prevention etc. Nowadays, It is widely used in many specific event to replace ice block. They are ideal for maintaining temperature in long time shipments or under special temperature conditions.