Portable and slim: Slim profile and lightweight construction make it easy to carry in any bag or lunchbox so you always have reliable cooling on hand. Durable PE construction: Reinforced PE material provides long-lasting stability and high break resistance, suitable for regular use in lunchboxes and daily transport. Strong cold retention: The expandable crystal structure binds cold efficiently and keeps food and drinks reliably cool for hours. Versatile and compatible: Designed for easy integration into cold-chain logistics and fan-assisted cooling systems. Works well for food cooling and for safe short-term storage of breast milk. Simple to use: Ready-to-use design requires no special handling. Fits into lunchboxes, coolers, and storage containers without extra setup. Practical performance: Consistent temperature regulation for a variety of needs — from keeping meals fresh to stabilizing sensitive items during transport. Use scenarios Work or school lunchbox: Slip the slim pack into a lunch container to keep sandwiches, salads, and snacks cool throughout the day. Breast milk storage: Provides stable cooling during short transfers between home and daycare or to and from a pump, supporting hygienic handling and temperature control. Outdoor activities and travel: Place in coolers for picnics, road trips, or sport events to maintain chilled drinks and perishable foods. Key attributes Function: Passive cooling pack for maintaining low temperatures in enclosed containers Material: Reinforced PE for durability and break resistance Form factor: Slim, lightweight, pocketable design for easy transport Performance: Expandable crystal structure for prolonged cold retention (keeps contents cool for hours) Compatibility: Fits standard lunchboxes, coolers, and integrates into fan-assisted or logistical cooling setups What you gain Reliable, portable cooling when you need it Durable construction for repeated daily use Easy integration into existing food- and milk-handling routines without extra equipment