Key Benefits Reliable cold-holding: High-capacity thermal storage combined with coarse crystal expansion delivers consistent, reusable cooling that maintains cold over repeated uses. Safe, predictable fit: A container-safe fill guide and no-overfilling instruction manage the water-absorbing expansion so the pack freezes to the correct size and fits securely in your container. Compatible with evaporative cooling: Crystal technology is optimized for use with evaporative fan cooling systems, improving chill performance without reducing reusability. Simple everyday use: A user-friendly freeze activation mechanism and integrated cooling crystals make this a practical, reusable alternative to single-use ice packs. What this product does and how it solves problems Keeps contents cold for repeated use: The thermal crystals store cold efficiently, providing sustained temperature control so food and drinks stay chilled on multiple trips. Prevents container damage and mess: The fill guide and no-overfill instruction limit expansion during freezing, reducing the risk of deformation or leaks and ensuring the pack fits lunch bags and small coolers as intended. Enhances evaporation-based cooling: When used with evaporative fan systems, the cooling crystals help maintain a steady, improved chill without compromising longevity or repeat performance. Key attributes Function: Reusable cooling pack that freezes to form a high-capacity thermal core; optimized for both direct chilling and integration with evaporative fan cooling systems. Technology/material: Coarse thermal crystals designed to absorb and retain cold efficiently while allowing controlled expansion during hydration and freezing. Compatibility/size: Designed and optimized for lunch bags and similar containers; also compatible with small coolers and evaporative fan systems. (Follow the included fill guide to ensure proper freeze-phase fit.) Performance: Engineered for repeated freeze–thaw cycles with sustained cold retention and consistent reusability when used according to instructions. Ease of use: Simple freeze activation mechanism and clear no-overfilling guidance to ensure correct filling, freezing, and placement. How to use (concise) Fill only to the indicated fill line using the container-safe fill guide. Do not overfill; follow the no-overfilling instruction to allow for hydration-triggered expansion. Freeze according to the product instructions until activated. Place the frozen pack in your lunch bag, small cooler, or integrate with an evaporative fan system for enhanced chill. Practical applications School or work lunches: Keeps sandwiches, dairy, and snacks cold in a lunch bag without leaking or deforming the container. Grocery transport: Fits into small coolers to help maintain perishables during short trips from store to home. Portable evaporative cooling: Works with evaporative fan systems for camping or small-room setups to improve chill consistency and retention. Why choose this product It combines controlled crystal expansion and high-capacity thermal storage to provide dependable, reusable cold with clear instructions to avoid common freezing and fitting issues. Designed for practical, everyday applications — compact enough for lunch bags, robust enough for repeated use, and compatible with evaporative fan cooling when extra performance is needed. Includes Cooling pack with integrated coarse thermal crystals Container-safe fill guide and no-overfilling instructions User-friendly freeze activation mechanism Follow the included instructions for filling and freezing to ensure proper expansion, fit, and ongoing performance.