What would you put in a car/house first aid kit if money was not an object?

I have a medical spending account that I can use to buy first aid supplies. I think having a good first aid kit in the car/house is a good idea. There are many prestocked first aid kits on the market, but I would rather make my own with items that I select. What would you put considering limitations of space, possible injuries, shelf-life, etc.

What would you use to store them. I like pelican cases.