Welcome to our store The package contains - 3 ice packs of different sizes. Small - suitable for swollen, bruised or children's ankles/eyes. Moderate - suitable for most injuries or pain such as knee swelling, headaches and arthritis. Large - suitable for severely injured areas such as shoulders or back. Each diameter - 11 inches wide, 9 inches medium and 6 inches small. Each bag has an opening diameter of 5 cm. Two ways to fill an ice pack: 1. You fill it with water by screwing on the lid and put it in the refrigerator2. Fill directly with ice. The exterior is made of soft fabric that provides comfort to the injured area. The interior is waterproof. The seal is tight and does not leak because the ice has melted over time. These are well-designed and durable cold/hot treatment cooling pads. They work well in ice and hot water. Ideal for muscle injuries and joint pain, bruises, sprains and strains. Aid needed for treatment. These ice packs are much better than gel packs/cold compresses that need to be attached, as they can move over the wound and add more relief. And they stay cold longer. Suitable for sports injuries and first aid.