ON = OFF / lotion and bathwash bottles

We oftenly found it is a bother to finish the residual at the bottom of soap, lotion and bathwash bottles. To address that problem, here is
the solution and concept of my new bottle design.
Use of the same material of the tub plug as the bottom for bottles. The residual liquid collected in the rubber cap whenever the content is
nearly finished. Just simply twist open the rubber bottom cap and pour out the remaining content.