The natural soap bags are great for exfoliating or massage. The friction creates foam on the skin, releasing dead skin cells and promoting blood circulation. 
The bag is made from Sisal, which is a plant belonging to the agave family. Its tough enough to clean and exfoliate skin,  and still delicate to not harm it in the process. The cotton drawstring allows you to hang the bag in your shower or bathtub so it can dry and keeps your soap close at hand for the next use.
 
The soap saver is 14 x 9.5 cm/ 5.5 x 3.7 inch in height and width, the proper size to hold most soaps