A basic combination of several popular designs currently available.
Cotton on one side & scrubby yarn on the other.
Worked inside out. Crocheted edge added later.
Gauge is not relevant.

By using scrubby yarn on one side only, allows the option to exfoliate or just lather up. Also, by placing ONE multi-functional loop, to be threaded through the sack, eliminates the need for a draw string or a button enclosure, AND provides a means to hang dry.