Shampoo bars and conditioner bars are ideal for travel as they do not take up a lot of space in your luggage. And as they are free of water, they do not need to be placed in the 1 liter plastic bag for airport security, thus leaving space in that little bag for other products you want to bring on your journey. The easiest way to pack your bars is often to put them back into the paper packaging or metal container they came in when you bought them.