I only keep some charging cables, a comb, and a backup deodorant in my cube at work. On my bike I carry a multi tool, mini pump, an extra tube and in very rare case of multiple flats I also have a small repair kit. If I manage to need to use tools to fix something I will suffer through with my multi-tool. Only time that didn't work out for me was when a crank arm came loose and I didn't have big enough allen wrench. Luckily for my most desperate situations there is a bike shop about a mile from work on my way home.