Make it, shake it, take it - It might look elegant and pristine, but the Shake & Go® Tumbler loves to get a little crazy and shake things up. With AUTOCLOSE technology. Shake It Up - Trap door under lid is designed for clean and easy shaking and mixing Seal It In - Leak-proof lid (when straw is removed) for on-the-go activities Don't Sweat It - Reduce slippery condensation with the double wall, shatter-resistant plastic body Perfect Fit - Fits most car cup holders and under single serve brewers for coffee or tea All Contigo products are BPA free