About this project Size: 9 inches. Premium leak-proof lid with large lid opening for easy filling of crushed ice. Easy to use. For cold therapy, just fill with ice and a little water to ease discomfort. For hyperthermia, just add some hot water (not boiling) and apply to the desired area. Multipurpose. For cold or heat therapy, cold therapy can be used for sports injuries such as headaches, fever, toothache, sprains, bruises, bumps, etc. Heat therapy can be used for muscle pain and spasms, sprains, strains and stiffness, etc. quality and safety. Say goodbye to annoying leaking ice packs! With a leak-proof lock, you can focus on immediate relief from a headache or any other injury without worrying about water spills. Get all the great benefits, ease and comfort at a lower cost and get your money's worth.