ok a couple of shots close up front and side
this one shows the clamping mechanism that holds the box tight to the rack, and is operated by a lever inside the box. In this shot its extended ready to fit the box.
this shows the lever up, which extends the clamp. the other metal tab is the lock retaining lug.
this is the lever pushed down, how it would be if the box was fitted, or just being carried etc. The clamping mechanism retracts into the tray base of the box so the rubber feet are first to contact the ground.
This is the bottom of the box, all of the ally channel sections are lined with a rubbery sustance to get a snug fit. The back one slots on as you push the box onto the frame, and the others locate as you push it down onto the frame, then finally the lever operated one clamps up from beneath. This produces the most secure attatchment i've ever used.
It is certainly waterproof and has a rugged and solid construction, well worth the money, as i rekon it'll last ages and will fit all their racks, if, god forbid, i change bikes. So would only need to buy a new rack. All round i think its excellent, way better than any ABS box, and should survive any spills easily.
Thanks Metal Mule