Soapin / soap used up

The soap will be too small to hold after using for a long time .At this moment , people always choose to throw it away .In order to solve the conundrum in using the last small soap, we have devised a new type of soap which has a irregular hole inside .We can put the small one into the new soap ,solving the problem and saving resources .Besides, it can consists with the small one whatever shape it is.