Our splash-proof Flip Lid features an extra-large opening that helps cool hot beverages more quickly and feels like you are drinking without a lid on at all. Designed to be opened one-handed, the Flip Lid also accommodates reusable straws and is BPA free. NOTE: Flip Lid is NOT leakproof. Small size fits 10oz Rise Lowball, 16oz Rise Tumbler and 12oz Camp Mug. Large size fits 14oz Rise Mug and 26oz Rise Tumbler.