A better question than "Do you have a medical kit" is "Do you know how to use it?".
First bandage, triangular scarf, calico bandage, sterile gauze and compresses, needle, curved scissors, plasters...
I have one set in my car, as it is part of the mandatory equipment in the car, and I bought the same one for the apartment.
Thank God, I didn't have to open the first aid kit due to injuries while driving, except when I once cut my palm while trying to help people in need, so I used gauze, bandages and plasters from the first aid kit...
As for first aid, given that I have passed the exam for a firefighter (I don't do that job, but my position requires passing that exam), I had training in first aid, for resuscitation, dressing, fixing...
I've always wondered how kits that include snakebite antidote are made. Australia has plenty of venomous snakes? When staying in the wilderness, you should have this package with you, and how would you apply the antidote, when each snake poison has its own?