The CarryAll bags are approximately 24" long x 6" wide x 12" deep. Note that their overall carrying capacity, however, is much greater, since they have a deployable sling that can be used for larger, bulkier loads.
These CarryAll Bags include a buckle-fix kit, so that the FreeLoaders on the left side bag can be cinched down. Once the buckle fix is installed, the bags can not be strapped over the top. Note that it takes 10-15 minutes to complete the buckle fix. instructions for doing so can be found here.