Key benefits — why you need this cooling pack Precise fill control and safe freezing: A container-friendly filling aid with an overfill limiter ensures you add exactly the right amount of water so the pack freezes to the correct size and shape without overflow or mess. Controlled expansion to prevent damage: An integrated expansion joint accommodates hydration-related volume increase during freezing, preventing deformation or leaks and improving handling safety. Reliable, long-lasting cooling: Cooling crystal technology and coarse-crystal expansion deliver strong cold retention and consistent performance over multiple uses. Reusable and energy-efficient: Designed for repeated freeze/use cycles to reduce waste and help maintain the cooling performance of portable coolers and air-cooling devices. What it does (functions and performance) Activation: Freeze to activate the cooling crystals — simple, user-friendly operation that requires no special preparation. Cold retention: Coarse-crystal expansion improves thermal mass and maintains low temperatures longer than plain gel packs. Durability: Intended for repeated use while preserving cooling capacity through stable crystal structure. Compatibility: Designed to fit inside typical coolers, travel ice boxes and portable air coolers (container-friendly design). Key features at a glance Filling aid with overfill limit: Ensures exact water volume for perfect freeze-phase fit. Integrated expansion joint: Absorbs hydration-related volume increases safely. Cooling crystal technology: Provides sustained cold and reliable performance over many cycles. Reusable cold compress: Practical for everyday cooling needs and transport. Practical applications (use scenarios) Camping and picnics: Keep food and drinks cold in a portable cooler for the duration of day trips or overnight stays. Travel coolers and road trips: Maintain safe temperatures for perishable items and medication while driving or parked. Transport and storage of breast milk: Safe, controlled cooling during short-term transport to maintain quality and prevent spoilage. Why this product stands out Precise filling and expansion control reduce the risk of leaks and improper fit after freezing. Cooling crystal and coarse-crystal expansion deliver stronger and longer-lasting cold than many standard gel packs. Simple freeze activation and reusable design make it practical for daily use without complicated setup. Usage tips Fill to the overfill marker only; do not exceed the limit. Freeze fully before first use for best cooling performance. Use inside a cooler or insulated container for optimal temperature retention. Compatibility and suitability Intended for use in coolers, travel ice boxes and portable air coolers. Suitable for cooling food, beverages, breast milk and general cold-compress needs. This description remains consistent with the original product functions: container-friendly filling aid with overfill limiter, integrated expansion joint for hydration-related volume increase, freeze activation with cooling crystal technology, reusable cooling compress with coarse-crystal expansion for strong cold retention, and suitability for camping, travel coolers and air coolers.