Consistent ColdHolding Power capacity thermal storage plus coarse crystal expansion deliver reliable reusable cooling. It provides longlasting performance and efficient icepack reusability for continuous use. Expansion Control System A containersafe fill guide and nooverfilling instruction ensure precise waterabsorbing expansion for an freezingphase fit. The expansionallowance design supports hydrationtriggered volume increase to enhance usability. Improved Cooling Performance Evaporative fan cooling boost with aircooler compatible crystals delivers cold retention and longlasting chill during repeated use, serving as a reliable cold source. User Friendly Designed for lunch bag cooling with an easy freeze activation method. Selfprep ice replacement using cooling crystals that are effortless to apply and assure reliable performance without hassle. Use scenarios Everyday lunch bag or meal prep: keeps sandwiches, fruits, and drinks cold during commute, school, or workday. Travel and outings: maintains beverages and snacks at a safe cold temperature on road trips, picnics, or day trips. Onthego cooling for perishable items: convenient solution for keeping small quantities of perishable snacks or other items cool during events or errands.