Objective: How can I use the sliver from a bar of soap without adding to the mess in the landfill?

Which of the following solutions is more sound in terms of naive physics reasoning?

Options are:
* When you open a new bar of soap, use it to bathe with, while it's still wet, meld the old soap wrapper to it, it will enable you to have enough to hang onto while using the old and NEW soap..
* When you open a new bar of soap, use it to bathe with, while it's still wet, meld the old sliver to it, it will enable you to have enough to hang onto while using the old and NEW soap..
When you open a new bar of soap, use it to bathe with, while it's still wet, meld the old sliver to it, it will enable you to have enough to hang onto while using the old and NEW soap.