myColdCup Water Bottle Ice Pack, Reusable Ice Stick. BPA-free. Won't Dilute Drinks. Convenient and Durable. Set of 6 (2oz) Use with vacuum insulated bottle and pre-chilled drinks. Will keep drinks ice-cold for 6+ hrs. For 12oz or smaller bottles, use 1 Ice Pack; for larger bottles use 2 Ice Packs. Won't dilute drinks. Great for juice, milk, smoothies, iced-tea. Any drink you want kept ice-cold. #2 HDPE plastic (high purity food-grade). Food-safe gel inside. No BPA Rinse off and place Ice Pack in freezer overnight before use. Does not retain flavors. Slides easily into narrow neck bottles. Each Ice Pack is equivalent to 2 ice cubes. More convenient than reusable ice cubes or ice tube tray.