Develop power and explosiveness with the SKLZ(R) Super Sandbag. This heavy-duty weight trainer holds up to 40 lbs of sand (not included). The Super Sandbag is an ideal tool for total body strength building. FEATURES: Heavy-duty training weight bag with durable shell Includes four 10-lb capacity weight bags (sand not included) Durable outer shell Maximum weight: 40 lbs Recommended for use with high-density sand Great for total body strength building