Make, shake and go! This 20-ounce Community® branded tumbler is perfect for shaking and mixing anything from iced coffee or tea to water enhancers or powdered beverages. The double-wall construction keeps beverages colder longer and reduces condensation. The auto-close trap door on the lid allows beverages to be mixed with no leaks or spills. After mixing, insert the straw and enjoy. This item is top-rack dishwasher safe. Shake & Go is a registered trademark for Contigo® brands.