What’s a good use for small pieces of leftover soap?

Put small bars into your suitcase when you pack. Your clothes will smell fresh.

There is a product called a soap saver . It is a net bag that you put slivers of soap in. Sold locally here at "5 and below stores". I have one. I put my "special soap" that I love in it, so you can use it until it is all gone. I just keep collecting the small slivers. Then use it in the shower. You could conceivably make one from onion bags.

You could purchase soap to make your own from a craft store and then add then pieces in.

Collect and melt them down and pour into mold for decorative soap.