Leak-Proof Design: Secure lid prevents spills and messes. Dishwasher Safe: Convenient top-rack dishwasher-safe design. Covered Drinking Surface: Keeps out debris and grime for cleaner drinking. Easy One-Handed Use: The AUTOPOP lid & chug mouth opening makes it easy for kids. Universal Size: Fits in most car seat cup holders. Interchangeable Lid: Also fits Contigo Kids' Casey and Micah Water Bottles. Long-Lasting Coolness: Vacuum-insulated, keeping drinks cold for up to 20 hours. 13 oz. size