- Exceptional Cold Storage: Our freezer batteries are filled with dry ice crystal particles that expand effectively, providing strong cold storage. With a large capacity and high energy retention, they ensure long-lasting cooling for all your needs. - Durable and Leak-Proof: Constructed from thickened PE material, this cool box is designed to be leak-proof and durable. Its space-saving design makes it easy to store, and it is simple to clean for your convenience. - User-Friendly Operation: To activate, simply add water to the ice crystal particles. Allow them to expand by reserving space, then place the unit in the fridge for 2 to 4 hours. Once chilled, it is ready to keep your packed lunches cool. - Long-Lasting Cold Insulation: These cooler ice packs are not only effective for food storage but can also enhance air conditioning by creating a frostier breeze. They are reusable, making them an economical choice for ongoing cooling needs. Practical Applications: - Ideal for family picnics, ensuring that your food remains fresh and safe for consumption. - Perfect for outdoor adventures, keeping drinks and snacks cool during hikes or camping trips. - Useful for daily lunch packing, providing a reliable way to keep perishable items at safe temperatures. Experience reliable cold storage with our premium freezer batteries and cool box, designed to meet your cooling needs efficiently.