The Quechua Hiking Ice Pack (2 Pack) by is useful for keeping your food fresh for lengthy periods of time. You get two ice packs that you can put in your backpack to ensure that the food you pack inside is fresh for hours on end. It’s compact in size so you won’t have any trouble fitting it inside. That is unless you are overpacking. Each ice pack weighs 6.2 ounces so it’s not adding on a huge amount of weight to your backpack cooler. Bring this with you along with lunch the next time you’re going hiking to test out how good of a job these ice packs can do.