The Serfas© Ark Expandable Half-Frame Bag can adapt to accommodate more gear with an expandable bottom and resists the elements with a durable water resistant construction. Thirsty? Pack your favorite hydration bladder and utilize the integrated Hydration Port routing.
Design Updated (2020) – We listened! We added 5 additional frame attachment points along the bottom of the bag for a more customizable and secure fit to even better accommodate varying frame shapes and sizes.