The Kupo&nbsp 13.2 lbs (Refillable Sandbag (empty) features durable construction with a velcro fastener for easily filling or emptying out pockets.A sand bag is a what’s known as a “Silent Grip” because it does its job efficiently without any complaints!Sand bags are necessary safety items. They prevent light stands from tipping over. They provide a down and dirty place to support a camera and also act as counterweights for booms. If you have people, especially children in your studio, a sand bag can prevent them from knocking down an expensive lighting fixture or worse causing injury to themselves or others.SpecificationsLength11.38 in (28.89 cm)Width8.38 in (21.27 cm)Height1.25 in (3.18 cm)Weight (Empty)0.45 lbs (0.2 kg)