A washcloth, storage bag, and soap dispenser all in one. 

This small but mighty bag is a must for your shower. It extends the life of your soap scraps by making them easier to use. When your bars are nearly used up, drop them into the soap-saver bag for storage. To use, simply wet the bag in the shower and use it as a washcloth. The soap scraps will lather right up and be dispensed as you wash. When finished, wring out excess water and hang from the convenient drawstring to dry between uses. The bag is made from all-natural sisal fibers (from the agave plant) and is soft yet scrubby, completely plant-based, and compostable at the end of its life.

Note: don't store full bars in a wet bag, as you'll want to give them more airflow to dry out (try this dish). The bag is best used to store soap scraps that might not otherwise get used.