Refreezable ice cubes are small plastic cubes or bags filled with nontoxic distilled water that can be frozen over and over again. They are typically called reusable ice cubes.
Reusable ice cubes are useful because the water stays inside the bag or cube when melted and there is no mess to clean up when they are used in coolers. Simply wash them in soapy water, and then refreeze them for the next use. Reusable ice cubes do not water down drinks like normal ice cubes do as they melt, and they melt much slower than traditional ice, which keeps drinks cold even longer.