Here is a plyo box made for jump training and conditioning. The REP FITNESS 3 in 1 Wood Plyometric Box is made of 3/4″ thick high grade plywood and measures 20 x 18 x 16 inches. It is ready for your box jumps, step ups, squats, and CrossFit training. It has sanded down edges for safety.
This box comes with pre-drilled holes for easy assembly. It can handle up to 400lbs of load. You can find out more about it here.