If you need an all in one, ergonomic plyo box then the 3 sided timber box is hard to beat! With 20"+24"+30" you've got all of the common heights covered. Simply flip the box over to change the height as required. These boxes are also stackable, so they don't take up much space.
Cyberfit wood plyo boxes are manufactured from 20mm ply, with internal bracing. Maximum recommended user weight 150kg.