Just had a rake through my bag. Currently it has:
15mm ring spanner, box spanner, 2 tubes, puncture repair kit, a load of latex gloves, tyre levers, a Topeak muti-tool, a Gerber Suspension, a Topeak Mountain Morph and assorted random painkillers.
Although to be fair, a lot of that surprised me as I don't clear it out very often.
Other stuff that's always in there: wallet, phone, headphones, iPod, Kindle, clean shirt, underwear and lunch.
And tonight there'll be all the food shopping I did in town at lunchtime.
Lock, trousers, towel, shoes and toiletries stay at work.