These products are great to take with you on your travels. They are small enough to be allowed in your hand luggage, so you never have to be without your favourite products when on holiday.
They are of course also great to use as a sample, this way you can try a product you are curious about or if you just fancy trying something else. These travel sizes are smaller and therefore a bit cheaper, so you can easily try out something new without buying the full size right away.
If you do find something you like, then you can buy the full size version.