- Superior Expansion: Our ice crystal box is filled with highly efficient dry ice crystals, designed for exceptional expansion and outstanding cold retention. Perfect for extended cooling periods, it boasts a large capacity and high energy density. - Easy Water Absorption: When preparing, the ice crystals expand as they freeze. For optimal performance, avoid overfilling with water. Just 2-4 hours in the freezer is sufficient to prepare them for lunch boxes or on-the-go needs. - Durable Construction: Crafted from robust, thickened PE material, our freezer packs are leak-proof, space-saving, and easy to clean, ensuring longevity and reliability for repeated use. - Extended Cooling Capability: Ideal as a coolant for air conditioning fans, this product enhances the cold air effect and can be reused multiple times without a decrease in performance. Use Cases: 1. Perfect for keeping lunch boxes cool during long commutes or outdoor activities, ensuring your food stays fresh and safe to eat. 2. Excellent for family road trips, providing reliable cooling for snacks and beverages, making your journey more enjoyable. 3. A practical solution for picnics or camping trips, maintaining the temperature of perishables without the hassle of ice melting and creating mess. Choose our ice crystal box for an efficient, practical cooling solution that meets all your needs.