This tin is really useful to store your shampoo bar when you go to the gym, go for a weekend break or on holiday. Just throw it in your bag, it's lighter than carrying a bottle of shampoo, won't spill or break and will last a long time.
An additional benefit when you use solid bars is that you can put them in your hand luggage on an aeroplane.
You are also helping to save the planet from plastic waste as one solid bar is equal to between 2-3 200ml bottles of liquid shampoo!