Keep the contents of your cooler food-safe cool with these durable and reusable Ice Packs. In several tests, Alaskan Series Ice packs have maintained food-safe temperatures for hours, even days, depending on your type of cooler and conditions. These Packs are just the right size to line the bottoms and sides of even the largest-sized coolers and can maintain temps of below 40º for hours while staying dry. In fact, using Alaskan Series packs in coolers combined with ice can maintain ice up to 50% longer. When finished using, simply store in your freezer until needed again. Great for tailgating, picnics and even weekend camping and fishing trips.