Stellar craftsmanship was required to make the Outline Pro deliver the performance it does. This carry-on is made with polypropylene which is a material highly resistant to scratches. let alone being extremely durable. Its 360 double spinner wheels make getting around tight corners at the airport so much easier. too. One of the best features is its USB port and a dedicated spot for your portable charger. so go ahead. with the Outline Pro. you'll be able to answer any of your important emails before take off.