Unlike the jack-of-all-trades utility of the closed top version, the OT-XXL allows for more rapid deployments while still delivering mondo capacity, and the horizontal configuration that can accommodate longer implements like saws, pry bars and levels. And you still get room to spare for supplies and what not. Need verification? Check the Specs: 17" H x 25.5" L x 9.5" W (12" H with handle folded down)