Have you ever tried a tumbler cup? Chances are you have. It's a double walled cup with a lid. Honestly a good tumbler cup is hard to find even though they are everywhere. The issues I have come across is that they either leak or the lid won't stay secure. That is such a waste of money. The chances you have tried an infuser tumbler aren't as high. You see this is the newest innovative way to add a little something extra to your beverage.