Good: Steel Plyo Boxes: Stackable tapered boxes similar to those used in high school and college gyms.
Better: Wood Plyo Boxes: Solid sides for greater safety. Ships unassembled to save on cost, but can be assembled in 10 minutes with included hardware. Used at the CrossFit Games. Made in the U.S.A.
Best: Games Box: 20, 24 and 30 inch box in one. Designed for the CrossFit games per their specifications. Made in the U.S.A.