Premium YKK zippers, sturdy 420D nylon fabric, water-resistant finish free from PFCs (chemicals that can be harmful to the environment) and coated base material on the bottom of the bag all provide extra layers of durability and protection that stand up to everyday use Adjustable harness optimizes fit for wider range of body types, ensuring most comfortable ride bluesign is a strict international criteria that ensures the protection of workers, consumers, and the environment Floating padded protection for laptop up to 16" and tablet up to 11" fits comfortably on back while in natural riding position Rolltop closure secures belongings and provides expansion when needed