mine is a pretty basic home made one. It contains:

Bandaids
antiseptic cream
antibacterial cream
bandage + closure
scissors
tweezer
gauze + tape
thermometer

That's about it, although I was regretting the lack of saline the other day. The gauze is great as you can use it to clean a wound, and also to dress a wound (holding it on with the tape) until you get a more appropriate dressing. I figure anything that can't cope with just a gauze dressing for a short while probably needs a trip to a doctor so I don't keep a type of dressing for every occasion.