If you end up getting a commercial box, it's worth taking the time to insert the optional glass overlay. It cleans easier, can be cut on and will prove more durable than the composite sheets. I've got a small 8X10 portable Testrite that is handy for taking out to a work table to spread out projects. I also am building one into my darkroom countertop as I'm accustomed to using at work. That way, the area serves a dual purpose and is always in the right spot in the darkroom.