My road bike has a saddle bag with a Swiss Army Knife, two tubes, patches, gloves, spare batteries for the rear light but only , co2 pump, allen keys, set of tyre levers.
My rucksack for commuting on the hybrid has a small pump, one tube, allen keys and patches, set of tyre levers, there might be a torch in there as well. If it is raining I sometimes chuck in a dirty cloth and some lube to mickle the chain when I get to work.