The GT 25L has a quick and easy closing mechanism using a quick-lock sail grade bungee cord to snap the top-cover shut. This system allows for quick and easy adjustment to utilized cargo space inside the bag. The back panel is Generation 3 soft-foam covered in a soft fabric shaped by the human back for ultimate comfort. Shoulder, waist and weight adjusters makes the pack adaptable to the weight carried inside which ensures for best ergonomics every time it is carried. 317309