Soft boxes and umbrellas are great lighting modifiers but they can easily become airborne from a gust of wind when shooting outdoors. Don't risk damaging your flashes or Moonlights. The Phottix Stay-Put Sandbags II are available in three sized and hold 3 kg/6. 5 lbs., 6 Kg/13. 2 lbs. and 10 Kg, 22 lbs. of weight and can keep a light stand firmly in place when shooting outdoors or in the studio. These are indispensable accessories. Shoot safely - always use a sandbag.