A bag to hold 1 bar of soap at a time.
 
They can be hung up in your shower between uses.
 
Bags also can be used for our shampoo & conditioner bars as well. 
 
They work very well to increase lather 4x better than using the bar alone.
 
They also make it easier to hold on to a bar in the shower and allow you to use those little extra pieces of soap that accumilate and are hard to hold on to.