Shampoo in solid form, from Lush (which has all sorts of wonderful products). I love that this helps eliminate unnecessary plastic bottles. I've tried most of their solid shampoos, and my favorites are Seanik, Jumping Juniper, and Ultimate Shine. They last a long time when you store them in the reusable tins. Diy, Lush Cosmetics, Puerto Rico, Shampoo, Best Shampoos, Shampoos, Lush Shampoo Bar, Shampoo Bar, Solid Shampoo Bar