Pura's Universal Lid fits on ALL Pura bottles and provides a totally water tight lid to any of the bottles. If you want to put hot water or a hot beverage in any of Pura's insulated bottles the Universal Lid is the best choice. Use with the 5oz or 11oz to securely store breast milk, baby food, or any number of snacks as it is the perfect size for lunch boxes! If your kids aren’t babies anymore then have your Coconut Latte or Green Tea poured straight into the 9oz or 16oz insulated bottle and add the Universal Lid for water tight transport of hot beverages on your way to the office. With the Universal lid you have the ability to use any Pura bottle to carry any beverage on camping trips, to the beach, to work, the gym.... Unbreakable stainless steel and plastic-free construction is not just for kids!