Simply fill the ice pack two-thirds full with ice and water to relieve discomfort from headaches bruises muscle aches and swelling. Discomfort may trouble you anytime anywhere. Keep a handy ice pack in your offices cars or at home for grab-and-go relief from pains. Made of waterproof safe and soft-touch rubberized fabric makes the water stay cold much longer. The Superior Leak-proof Cap with a large opening is for easy filling of ice cubes or crushed ice.