- Compact, lightweight design: small form fits easily into pockets or bags, enabling portable, reliable cooling for outdoor activities or daily use. - Reinforced PE material: durable stability and impact resistance for long-term use; ideal for regular lunch-box cooling to reliably keep food cold over extended periods. - Flexible applications: suitable for food cooling and breast milk storage; supports cold chains during transport and provides effective cooling for ventilation systems; versatile with steady performance for various household and on-the-go cooling needs. - Stable cooling performance: expandable crystal structure delivers strong cold retention, keeping foods and drinks reliably cool for hours. Use scenarios - Keeps lunch, snacks, and drinks cold during commutes or school days. - Cools expressed breast milk during outings or travel. - Supports portable cooling for picnics, hiking, or other outdoor activities where reliable cold retention is needed.