You'll have enough for all your food cooling freezer packs demand. Reusable and versatile cooler packs. Colder than ice at 18° F (-8° C) to keep your food and drinks cold for longer! Reusable & Safe for Everday: These lightweight and portable freezer packs are made with PET. Easy to clean and reusable, great replacement for traditional ice cubes. Easy to Use: Before using, add water once using the funnel, shake, screw cap on, & freeze until ready to use. Filling the ice-cold pack is easy freezy, perfect chillers for everyday use. Safe and Reusable: Reusable portable ice packs are made of sturdy 100% safe material, easy to clean, and can be used repeatedly. Cold packs for cooler are more practical than ordinary ice cubes. Chilled Food - Even Without the Fridge: These ice packs will keep your food and drinks chilled when you don’t have access to a refrigerator. Great for freezer-to-lunch bag trips or any occasion - lunch bags, cooler backpacks, breastmilk bags, work, or outdoor camping. You'll have enough for all your food cooling freezer packs demand. Included in a set - Four corks & one funnel.Save more space for your coolers & Extended the food and drinks cooling time.Add Water Once & ReusableThe inside of the ice pack is filled with a proprietary cooling gel mixture, just add water at home, shake and seal, and then turn it into a solid block after freezing, which creates a reusable ice pack. ice packs start out at freezer temperature and gradually heat up. Throughout the melting process, ice packs maintain the advantage of a lower melting point than traditional ice cubes.When the ice starts to melt and warm in your cooler, ice packs still remain cold, even as they begin to thaw.