Is it a backpack? Or is it a duffel bag? The DaKine Roam Duffel Bag 60L is "technically" a duffel bag. But once you attach the optional backpack straps, you'll unleash a whole new world of carrying capabilities. 60 liters of space is offered to stow all of your gear and can easily be used as a carry on for air travel, or even a caddy for your gym shorts. The DaKine Roam Duffel Bag 60L is equipped with YKK™ waterproof zippered pockets, so whatever you pack, you can be sure it'll stay dry in transit.