I strap two waterproof duffels on the rear rack (overboard) & i've recently swapped to Thule lockable straps as the wire soon came thro' on the kanulocks & caused jamming. the overboard bags had a loop in the handle where it attached to the bag, so I just pass the straps thro' the loops vertically. with anything its just a deterrent, someone with a knife couldn't cut thro' the straps but could easily cut thro the bags. if they want my pants & socks then they're welcome. just watch you don't overload them. I think it's 25kg on the securing points, I was well over that for my first couple of alps trips. I bought two 60l bags for the back, they fit perfect if you don't over pack them to much so as to obscure the upper brake lights (ive the spare wheel). got the orange bags, they've really faded, but it still looks like a life raft strapped on the rear! ive had a couple of light scrapes at the rear with the extra weight, but that's with two large boned people aboard. just had the nitrous fitted, so I may raise the height this year a touch. (thats a lie, as im far too lazy to do that)