This Universal Heavy-Duty Tripod Stone Bag from Sunwayfoto fits most tripods buy attaching quickly and easily via three touch-fastener straps, allowing tripod stability to be increased by adding weight below the center of gravity. Made of black nylon fabric that is tear-resistant and abrasion-resistant, this bag is divided into three sections which can be filled with lenses, other accessories, or even rocks and sand to provide ballast.