Bar soap is a more eco-friendly choice : did you know that the carbon footprint in general is 25 percent more for liquid soap over bar soap ?
Why? In large part because we use almost 7 times more liquid soap than bar soap. That extra soap means more chemical feedstocks and more processing, and thus more energy and carbon emissions. Liquids also require more energy for packaging production and disposal.
Now that you know the numbers, you have 2 zero waste possibilities : bars soaps or refilled liquid soaps!