If You Know Me, You Know I am Always Saying the Best Amount of Ounces is 20 Ounces. So, Our 20oz Temp Retention Holding Tumbler is Perfect! For Anybody! Look, It is Time to Stop Drinking Your Favorite Beverages Out of These Dull and Boring Containers, and Level Up Your Drinking Routine to Reflect Who You Are... Cool, Confident and Hydrated! Our 20oz Vacuum Tumbler are Equipped with Stainless Steel Double-Wall Construction and are Insulated for 2X the Amount of Cold and Heat Retention.