Improved Thermal Storage Support Provides strong coldholding performance through capacity thermal storage and coarse crystal technology, delivering reusable cooling that stays effective over multiple uses without degradation. Precision Filling Design Includes a containersafe fill guide and a clear nooverfilling instruction to regulate waterabsorbing expansion, ensuring accurate freezingphase fit. Supports hydrationtriggered volume improvement through a reliable expansionallowance structure for convenient use. LongLasting Chill Effect Achieves extended cooling performance with advanced coldretention crystals that work with evaporative fans to improve air cooler efficiency, while ensuring repeateduse functionality. Effortless Setup Optimized for lunch bag cooling needs, this product uses a userfriendly freeze activation mechanism and cooling crystal integration, delivering a practical and reusable icepack replacement designed for effortless everyday application. Use scenarios For daily lunch bags or compact coolers to keep meals fresh during a commute or school day. In travel, work, or gym bags to maintain beverages or snacks at a safe temperature. As a reusable icepack replacement in portable coolers, picnics, or short trips, compatible with evaporative cooling setups for extended chill.