The backpack's removable rolltop bag has a TPU lining that ensures odor, moisture and dirt doesn't spread to the rest of the bag. It's also easy to clean and is perfect for storing sports gear or dirty clothes. The carry-on bag has dedicated areas for electronics storage and a water bottle pocket. The Thule Aion Sling (sold separately) can be used together with this travel backpack as a hip belt for extra weight-bearing support and quick access to essential items.