1. Reusable ultra-thin ice packs for lunch bags, lunch boxes, and coolers. They are durable and serve as accessories for coolers and lunch boxes. These frozen ice packs are colder than ice and can keep food fresh during camping, traveling, and picnics. 2. Specifications: - Name: Camping ice packs for coolers - Composition: Dry ice crystal particles - Material of the ice crystal box shell: HDPE (High-Density Polyethylene) - Dimensions: 19*6*4 cm / 7.4*2.3*1.5 inches - Usage method: Use by adding water. Just add water once and they can be reused. - Application scope: Food refrigeration and preservation, breast milk preservation, air cooler fans, nursing cooling, barbecue self-driving tours, refrigeration, transportation, etc. 3. Precautions: - Do not open the lid and drink the substances inside the ice crystals. - If the liquid overflows during the expansion of the ice crystals, clean it with a neutral detergent and water. - Keep away from fire sources or high-temperature objects. 4. Packaging list: 4 camping ice packs