Just received the Tanos Toolbox a few days ago, thanks BuilderBob and have already put it to good use. This is NOT a review, but more of a product description. It is a box, with a divider, a handle, and it fits on top of other systainers. Thats it, review over. As far as the size, its in between a sys1 and sys2 when there handles are up. As you can see in the pics, it easily holds a c12. I have been carrying mine around fully loaded attached to a screw sys1, fully loaded and a sortainer that is full of small install tools. Pretty heavy to lug up to the second floor for some of you old timers, but a joy to work out of. I used to make so many trips to my box van, but now just load up and still make a couple of trips bc thats remodeling for you, but at the end of the day, everything goes in the toolbox and youre not fumbling around with stuff. Maybe its bc its anthracite grey or bc its linked to my beloved Festool but IM a huge fan of this product, which at $50.00 is a steal for its overall value, Eric