A situation will happen in our daily life, that is we no need to hold an umbrella when it still has to be taken.
We cannot avoid taking the umbrella but we can change the way of taking it. And this is just our concept umbROLLa.
If you are tired of holding it, you can just drag it away.
Actuallly dragging the umbrella to go is a habit from our behavior of childhood. So now umbROLLa is not only more useful for child to take in their own way but also for adult.