The Prolimit windsurf session board bag is an unique windsurfing quiver board bag.It features two separate zippered compartments. The windsurf session boardbag has a bottom section as performance board bag bottom and top section as our aero session bag. For all session bags Prolimit uses the universal wheel base. The universal base fits all 3 sizes of the windsurf session board bag improved wheel base for easy carrying. The wheel base is optional!