Here is a hybrid weight that works as a dumbbell, kettlebell, double grip med ball, and push up stand. The YBell 4-in-1 Arc series weigh 5.5lbs. They are comfortable to hold and let you switch grip easily to push more muscles in your body.
This hybrid weight has a space saving design. You can grab the outer grip for kettlebell training and the center grip for dumbbell exercises.