Strong Cold StorageFreezer Packs contain dry ice crystal particles, coarse particles, good expansion, strong cold storage, large capacity and high energy storage for long-term cooling cycle use.<br> Leakproof and StrongFreezer Packs for Cooler case is made of thickened PE material. Leak-proof, sturdy, doesn't take up a lot of space, and is easy to clean.<br> Easy to ApplyYou need to add water to use it by yourself. After adding water, the ice crystal particles will expand. You need to reserve a certain space. After expansion, put it in the refrigerator for about 2-4 hours and then take it out for lunch bags.<br> Cold InsulationWith the characteristics of long cold storage and reusable use, Cooler Ice Packs can be used as conditioning fans to make the cold more frosty.<br> Multiple OccasionsIce packs are widely used in various cooling scenarios such as food preservation, conditioning fan cooling, incubator preservation, back milk preservation, fish preservation, and pet cooling.<br> Specifications:<br> Name: Ice Crystal Box<br> Material: thickened PE<br> Specifications: 1pcs, 2pcs, 3pcs<br> Composition: absorbent resin<br> Size: S: approximately 16 * 4cm * 4CM/6.30 * 1.60 inches * 1.60 inches<br> M: Approximately 19 * 6cm * 4CM/7.48 * 2.36 inches * 1.60 inches<br> Solidification point: -12 degrees<br> Number of uses: No upper limit (if not damaged)<br> Purpose: To be used with water. Just add water once and you can reuse it.<br> Scope of application: food refrigeration, breast milk preservation, conditioning fan ice crystals, care cooling, barbecue self driving tours, refrigerated transportation, etc.