Originally Posted by Dave Cutter

That particular kit.... is a little underwhelming for me. Even in my fast bikes small, light bag, I have a few more things.
Of course a tube (for the bike you're riding). I put it in a one gallon Ziploc bag (for the old tube, see below).
A scab patch kit (they're tiny) you keep the tube you replace... and repair it for the 2nd flat (see above).
Two tire levers (I don't like matching ones) I prefer one thin and one thick.
About a foot of duct tape.... wrapped around one of the tire levers.
A multi-tool
A mini [swiss-tech] plier
a small knife
I prefer C02 inflators, and a 20 gram cartridge (learn how to use it before you need it)
1 each individual handy wipe.
A "tube" of chap-lip stuff.... for lips and emergency bike lube.
2 small wire ties
I like to carry a cheap cable bike lock. Rarely do I leave my bike for even a minute. But if I do it has a lock that might deter an antsy juvenile.