The best tumbler has a tumbler top in a straw , but it also comes with a rubber tap that you can insert a coffee cup from your favorite coffee shop.No need to pour it out into the container.Just push it right down inside and it will keep temp! This is handmade from resin Micah and alcohol inks.It does have some areas of unevenness in the resin.There is some resin missing from the bottom , but because of the ridge , it should not affect anything. It is possible to break the resin if you drop the cup.So it is not returnable and hadn't washing is recommended
