I bought a Rubbermaid box. I think it's called Actionpacker or something. It sits nicely underneath the tonneau. I'd drill holes in it, and mount it on the bed using the bolts already there, but my Bedrug makes that option non-existant. Besides, I haul enough things that require me to move it. But, I've got two locks on it, so it's relatively secure, and it works well. Out of sight out of mind.