Our specially formulated KoolerGel The Ice Extender is reusable and refreezable and stays colder longer than conventional ice. Lasts 30-40 percent longer. Does not turn back to water, stays a gel, just add more water as needed. Recycle used plastic soda bottles and keep waste out of our landfills! Can be used in any ice chest or food cooler and is great also for camping and picnics. Non-toxic! Comes in a convenient 1-pack, enough to make six 2-liter bottles of KoolerGel. The 1-pack price shown ($13.95) includes $2.00 flat rate USPS shipping.