2 Ice Packs For Cool Box Reusable Freezer Blocks Long Lasting Pack Kids School Lunch Boxes Camping, Picnic, Hiking Small Fridge Air Cooler

【Water Swelling】Ice crystals will expand during the process of absorbing water and freezing, so do not fill up when adding water, you need to reserve certain space. Place in the refrigerator to freeze for about 2-4 hours and can be removed for use in lunch bags, etc. 【Good Expansion】This ice crystal box contains dry ice crystal particles, the particles are coarse, the expansion is good, the cold storage is strong, the large capacity and high energy storage are used for long time to cool down and cycle. 【Good Cold Insulation】Cooler Ice Packs can be used as air-conditioning fan ice crystals, cooling air-conditioning fans to make cold air more frosty, super long cold storage, and can be used repeatedly. 【Multiple Occasions】Ice packs are widely used in various cooling scenarios such as food preservation, air conditioning fan cooling, incubator preservation, back milk preservation, fish preservation, and pet cooling. 【Durable Material】Freezer Packs for Cooler shell is made of thickened PE material. Our cooling packs are leak-proof, sturdy, don't take up lot of space, and are easy to clean.