I used to grow sprouts in Mason jars that I would lean top down onto a wooden rack made by my engineer dad. The rack was large enough to hold 4 large jars at a time, and probably sturdy enough for 4 people to stand on. While this was a great system for when I had a decent-sized kitchen, in a condo, I needed something more compact. Last year I discovered the Easy Sprout Sprouter–what a find!