Portable cooling you can carry The compact and lightweight design fits into any bag for easy portability Provides cooling power on the go to help keep items fresh Preparation: Fill water with ice packs to freeze 24 hours in a natural expansion freezer. This is a reliable method to ensure you control the temperature of your lunch box Multifunctional design: Designed to work with cold storage and air conditioning logistics fan systems, from food cooling to breast milk storage. A convenient cooling solution that effectively meets a variety of cooling needs, from everyday life to business use Durable construction: a very thick PE ice pack that resists damage and provides stable performance even with repeated use. Ideal for longterm use, meeting the needs of your lunch box freshness Key attributes Function: portable cooling on the go to help maintain freshness Compatibility: works with cold storage and air conditioning logistics fan systems; suitable for food cooling and breast milk storage Size and weight: compact and lightweight for easy bag inclusion Material: very thick PE ice pack noted for durability Performance: reliable temperature control after prefreezing, durable through repeated use Use scenarios Everyday life: keep lunches or perishables cool during daily commutes, school days, or errands Business use: maintain temperature for meals during work trips, meetings, or onsite visits Breast milk storage: suitable for keeping breast milk cooled during travel or temporary storage away from home