What should be in a first aid kit?

What a first aid kit should contain according to the Red Cross, and which ready-made kits come closest.

Our bar: Contents checked against Red Cross guidance. How we check

Buying guide · 9 min read The Best First Aid Kits, Checked Against the Red Cross List What should be in a first aid kit, item by item, from the American Red Cross, St John Ambulance and the HSE. Then the ready-made kits that come closest, and exactly what each one is missing. Read the answer