Service promise: If you have any problems with the ice packs, please contact us for assistance. We will provide a satisfactory solution. Food-safe: Made of plastic and ice crystal particles, non-toxic. Compatible with a cool box or cool bag. For first use, fill with water to 85% of the pack volume. Wide range of applications: Use to transport flowers, fish and meat, fruit, vegetables, and medicine. Suitable for picnics as a cooling aid. Can also be used as a cold compress to reduce temperature and swelling. Powerful: Space-saving design. Temperature range from -18 to +40 C. Reusable and capable of being used many times. Cooling time up to 12 hours. Use scenarios: - Transport perishable items (flowers, fish and meat, fruit, vegetables, medicine) during deliveries or travel to maintain proper temperatures. - Picnic or outdoor outings to keep foods and drinks cool. - Cold compress use at home or in clinic to help reduce swelling or fever.