The Everlast Cardio Fitness Training Bag is a solid foam-filled striking bag with a durable construction made to withstand even your hardest hits. The heavy-duty spring neck allows for a quick and responsive rebound. Easily assemble in five steps to start working on your muscle tone, reflexes and endurance. Durable foam Fitness bag Base fills with water or sand Engineered for cardio workouts, endurance & strength training Height approximately 64" Weight: 13.2 lbs.(32 lbs. when base is filled with water or sand)