The Thule Aion Travel Backpack - 40L is great for those who are always on the go. It has plenty of space for all of your important items while remaining within carry-on specifications. This durable bag is made from recycled material and features a water-resistant treatment to protect your belongings and prevent staining. Several pockets keep your items organized and easy to find, with a convenient side water bottle pocket. The removable rolltop bag is great for securing dirty clothes or anything that you'd like to keep separate.