Exaco Ergo Stacking Raised Garden BedsExaco Ergo Stacking Raised Garden Beds The Ergo "Quadro" series is a modular raised bed planter system with a four sided square rectangle design, similar to the popular hexagon shaped Modular Planter System. It comes in three sizes to perfectly fit any available space and can be stacked to any desired height for different applications. Each basic set includes 4 panels that are 10 inches high and can easily snap together without the need for tools.