Softboxes 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 studio lights. The Phottix Stay-Put Sandbags II are available in three sized and hold 3kg (S), 6kg (M) and 10kg (L), 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.