- Easy to Carry: This portable and space-saving cooler pack fits seamlessly into any backpack, allowing you to transport your lunchtime essentials without adding extra bulk. - Durable Construction: Designed with a reinforced PE core, this cooler pack is built to withstand regular use in lunchboxes, ensuring both break-resistant performance and exceptional longevity. - Versatile Use: Ideal for preserving breast milk and keeping food cool, this pack is perfect for transportation cooling and fan cooling support. Its user-friendly design provides adaptable cooling solutions for daily needs, maintaining consistent quality. - Reliable Cold Retention: The expandable crystal structure provides excellent cold retention, keeping your meals and beverages reliably chilled for hours. Usage Scenarios: 1. Pack your child's lunch with this cooler pack to ensure food stays fresh until lunchtime. 2. Use it for transporting breast milk during outings, maintaining safe temperatures throughout the day. 3. Perfect for outdoor picnics or beach trips, where you need to keep snacks and drinks cool for extended periods.