Backpack in the car is also ready for the dog to eat for over 24 hours. My First Aid Kit is an old round top lunchbox and has had many uses when other people along the road needed the supplies or my skills with them.
Glad to hear you feel the same things are important. How about at home?
If you mean first aid supplies at home, I'm a few items short of an equipped emergency room and I mean that. I have enough supplies for me and for other people to treat many medical problems. I'd just put on my white coat with my EMT badge on it and go to work helping others. Understand, I would not do that unless it was safe - the first rule one learns in EMT “school”, is safety for one’s self FIRST.