Bar shampoo is essentially the same as liquid shampoo, except that it’s packed into a bar form. Shampoo bars are designed to eliminate dirt and product build-up, leaving you with shiny, clean hair. They last longer than a liquid shampoo- one bar can give you around 80 washes. Shampoo bars are as well great to travel with as you don’t have to worry about any potential for spillage or liquid restrictions. This shampoo-type is environment-friendly as it requires no plastic packaging.