Reusable cold solution with high heat capacity: Advanced crystal structure stores and releases cold effectively for extended cooling support. Designed for repeated use without loss of performance. Precision filling and safe handling: Integrated fill-level indicator and clear anti-overflow instructions make refilling simple and safe. The design compensates for expansion during water intake and freezing to prevent spills and ensure correct freeze behavior. Expansion-tolerant construction: Internal tolerance for gradual volume increase during filling and freezing preserves integrity and maintains reliable performance over many cycles. Wide compatibility and practical function: Works as a versatile thermal tool for safe cooling of food and breast milk. Ideal for use in cooler bags, travel refrigerators, camping setups, and compatible with portable air coolers. Easy activation and convenient replacement for ice: Quick to prepare and activate, the product functions as a ready-made ice substitute that delivers steady, predictable cooling without the mess of melting ice. Performance and reliability: Combines practical form and engineering for consistent cooling results in a range of everyday and travel situations. Typical use scenarios: Travel and camping: Keep perishable food and drinks chilled in soft coolers or portable fridges during day trips and overnight trips. Breast milk transport: Maintain a safe temperature for expressed milk during outings or visits without relying on single-use ice packs. Portable cooling with air coolers: Pair with compatible air coolers to extend runtime and stabilize cooling performance. Key attributes: Function: Reusable cold pack that replaces ice for prolonged cooling. Compatibility: Suitable for cooler bags, travel refrigerators, camping gear, and compatible with air coolers. Performance: High heat capacity and stable cooling due to advanced crystal structure. Handling: Precision-fill design with fill-level indicator and anti-overflow guidance; expansion-tolerant internal structure. What customers gain: Reliable, repeatable cooling without the mess of melting ice. Safe transport of food and breast milk with predictable temperature support. A practical, easy-to-use solution for travel, outdoor activities, and portable cooling needs.