I recently tried solid shampoo, and am shocked it isn't more popular in the prepping community. Consider 1) It cannot leak and make a giant mess. 2) is extremely compact. one small bar of soap is equivalent to at least 2-3 bottles of shampoo. 3) Gets your hair clean without all the strange ingredients or lingering perfumes. 4) Can be purchased from small businesses, who still use traditional recipes. I've been using solid shampoo for a year now and am incredibly impressed. Honestly, I won't be stocking anything else. Hate to admit, but I used to be one of those women who insisted on salon quality shampoo...never again. This stuff is awesome!