Cons: liquid packaging
Liquid soap is arguably one of the most wasteful "green" products things you can buy. Let's face it - liquid soap is mostly water. And, it comes in plastic packaging which isn't truly recyclable, it's really just "down-cyclable."
Clearly - using bar or powdered soaps is a more green option.
That said - Dr Bronner's liquid soaps are possibly my favorite soap -- I can use them for my skin, my hair, my cat, my shower, my dishes, my car. The soaps are biodegradable which means -- yes -- you can take them camping. Washing your hair over a bucket and rinsing right onto the ground. The bonus with Peppermint is that it leaves you feeling very tingly and clean -- it's a good thing.
However - I won't be buying anymore liquid soap once I run out of my giant size bottles of Dr Bronner's - it's just not in line with what I consider really green.