Constructed like a saddle bag, the Heavy Bag has two pockets that can be filled with sand or lead shot to provide weight. Each pocket closes with two zippers that open in opposing directions so sand doesn't leak out. A handstrap on top opens with a side release buckle, allowing you to securely attach the Heavy Bag to the leg on a light stand, C-stand or tripod. [Note: Heavy Bags do not include sand or lead]