For hair: take your bar out of the bag to use on your hair, (friction from the bag can cause hair damage). Pop the bar back in after use for easy drying.
For face & body exfoliation: pop your bar (or pieces) inside the bag and secure with the drawstring. Wet the bag and massage across your skin for extra exfoliation and lots of lather. Hang after use to allow the bag and bar(s) to dry thoroughly. Handwash your bag between bar refills to keep it clean.