I take a couple of multitools, one with a selection of allen Keys and screw drivers, one with a little wrench, a chain splitter and a couple of allen keys. I also take a crank remover, spoke key and cassette remover (though that's pretty useless without a chain whip, but I figure I could rig something with my chain and a tent peg or something if I really had to). I take a few spare bolts, patches, a couple of tubes, tyre levers (metal, the plastic one are useless), a small pump and a couple of spare spokes. I also have a few spare multi spanners and a spare little wrench which sometimes comes along, but goes with my friend (he borrows my other tourer).