Meet the dimok Aqua Bag: a full body training tool for CrossFit and other challenging routines. It weighs 3lbs when empty but you can fill it to water to reach 79lbs in weight. These bags are ready for cardio and HIIT. You can do lifts, swings, curls, step-ups, and rows with them.
The dimok Aqua Bag is available for under $85 at this time.