"Punching Bag Punch" is a self-standing home sandbag. It's an air-filled type that won't hurt your hands or feet even if you hit it hard. Please fill the bottom with 5 liters of water. The absorbent polymer provides excellent stability, and it recovers surprisingly quickly! Great for stress relief, exercise, and shaping up for adults, and can also be used as a toy for children. Comes with a foot pump for easy inflation. (Quoted from Amazon) The box has only been opened. Please purchase only if you understand that this item has been stored at home.