What are the things you have to store in a first aid box?

I have a first aid bag and inside that I have:

Bandages

Scissors

Antiseptic wipes

Plasters of various sizes

Cotton pads

Small sticky tape for cotton pads

Antiseptic cream/gel

This is what I can remember that I have and for different circumstanses you need special equipment (like insect repelant). For a first aid box there will probably be more of each item plus a few extra things.