Thule Aion Travel Rucksack 28l Dark Slate 28

All Thule Aion products are bluesign certified Compatible with the Thule Aion Sling Bag, which doubles up as a supportive hip belt (sold separately) Dedicated water bottle pocket keeps your bottle secure and within reach Expands from a 28L day pack to a 32L travel backpack for 15% more packable space External daisy chain allows you to attach items to the bag