I put tools in my (locked) panniers. This is so obvious that I don't know whether I'm missing the OP's point. In fact I put everything in my panniers, except a few things which don't fit: helmet, tires, etc. These get cable-locked to the bike. I've never used cling wrap, but it makes sense if you're worried.
Last edited by markharf; 12 Mar 2011 at 22:13.