within city limits there isn't a real need for a first aid kit. So far in the current modern world, I've had no use for the kit. But it's just me.
I have a full combat trauma/ surgery kit, but never had a use for it. Since I got the kit I've traveled in a ambulance more times then even opened my kit.
If you really need a kit, put one together per your needs and situations.
besides the basic bandages and gauze in my kit, I have blood clot powder, artificial skin, burn oniment, saline solution, IV's, chest tubes, airway openers, setheascope and cuffs, full surgery kit ,and a few medications I can't mention in public , etc....