The Thule Aion 40-L backpack features a removable rolltop bag. Its maximum capacity still falls within the carry-on range, making it perfect for air travel. The removable rolltop bag is equipped with TPU lining, which protects the rest of the luggage from odors, moisture, and dirt. Additionally, it is easy to clean and ideal for storing sports gear and dirty laundry. The carry-on piece also includes dedicated areas for storing electronic devices and a water bottle pocket. The Thule Aion Sling (sold separately) can be used with this travel backpack as a hip belt for better weight distribution and quick access to essential items.