The design is the same feature-rich, travel-tested specification from Roam’s TECH bag. The Double Slim also has an expanding hidden sidewall to convert from a single to a double board bag and back to a single in an instant. Its a super versatile design for travel.As with all of Roam’s bags it is cut longer so a bag will fit the size that it is labelled for.ie. a 68 bag will fit any size up to and including 68 so you can carry your groveller and your step up when checking the surf.