A durable, portable for the lighting or imaging professional includes at least a first collapsible frame adapted to support a light modifying flag or a light modifying net. The collapsible frame includes first and second rigid frame components 22, 24 carrying fixed hinge pins 38 that connect to first and second foldable frame components. The collapsible frame defines frame components with frame ends and the kit includes at least one light modifying flexible material segment with frame end receiving portions. The collapsible frame has a first erected size and the flexible material segment has a second size not greater than said first size so that the collapsible frame, when erected, permits a user to place the flexible material flag or net under tension upon the frame.