What this product does for you Controls freezing expansion: a container-friendly filling system with an overfill limiter regulates water uptake and expansion so the pack fits properly during the freeze phase and avoids deformation or leaks. Stable, reliable cooling: an easy activation process (freeze before use) and integrated cooling crystals provide consistent temperature control in coolers and portable refrigeration units. Long-lasting cold retention: coarse-crystal technology and high heat-storage capacity deliver strong cold retention and repeatable performance across many uses without noticeable loss of effectiveness. Why customers need it Prevents spills and pressure build-up while freezing, reducing hassle and protecting cooler contents. Provides predictable, maintenance-free cooling for everyday use: pack, freeze, place in your cooler. Reusable and durable: designed to maintain performance over repeated freeze/thaw cycles, giving ongoing value. Key features and attributes Function: refillable cold pack with overfill limiter and expansion-friendly design for safe freezing and reliable fit. Cooling system: freeze-activated with integrated cooling crystals for steady temperature regulation. Performance: high heat-storage capacity and coarse-crystal internal structure for strong cold retention and repeatable results. Compatibility: container-friendly design that works with coolers, travel refrigeration boxes, and many portable air-cooling setups. Reusability: engineered to withstand multiple freeze/thaw cycles while maintaining cooling power. Practical use scenarios Camping and outdoor trips: place in your cooler to keep perishable food chilled for day trips or multi-day outings. Travel coolers and road trips: fits into portable coolers to stabilize temperature and reduce the need for frequent replacement ice. Safe transport or storage of breast milk: maintains a consistent cool environment in travel or medical coolers to protect sensitive contents. What makes it stand out Thoughtful expansion control prevents overflow and deformation during freezing, improving safety and longevity. Integrated crystal technology delivers consistent, reusable cooling performance without complicated activation steps. Versatile compatibility for multiple cooling applications—practical for home, travel, and outdoor use. Usage tip: freeze the pack according to your freezer’s instructions, avoid overfilling beyond the limiter, and place the frozen pack directly alongside items in your cooler for best temperature stability.