It is said that 70% to 80% of liquid shampoo and liquid detergent are water, and most of the bottle containers are made of plastic. Since they are classified as "plastic containers" rather than "plastic bottles", they are often disposed of as combustible garbage instead of being recycled. On the other hand, many bar soaps are wrapped in paper, making it easy to choose plastic-free. Also, if you collect the soap that has become smaller and put it in a soap bag, you can use it up without waste until the end. It is a substitute for a bath sponge and is recommended for travel destinations.