Here is a sandbag with 8 handles to help you push your body in a variety of ways and build strength. The Meister 50lb Elite Fitness Sandbag comes with 3 removable kettlebells (19, 15, and 20 lb). It supports curls, presses, squats, and a wide variety of other workouts.
The inner core is thick, so the sandbag maintains its shape as you work it. Like what you see? You can get one of these for around $80.