Expands from a 28L daypack to a 32L travel backpack for 15% more packable space The easy-to-clean TPU divider keeps items organized and prevents odor, moisture, and dirt from spreading to the rest of the bag, it also tucks away when not in use Zippered top pocket keeps small items secure, organized and within reach Compatible with the Thule Aion Sling Bag which doubles up as a supportive hip belt (sold separately) Quick-access external stash pocket helps store small items