BUY. We like DuJardin’s Volume and Shine Shampoo Bar a lot. We’ve tried ByHumankind, Public Goods, and Lush shampoo bars — this is our favorite so far. Reason why we like this the best? This is the only zero-waste shampoo bar we’ve tried where you don’t absolutely need to do the acidic rinse afterwords. While this one is sold out, we would be excited about trying one of their other shampoo bars.