I used to do a lot of car-camping. Seems like less and less each year. I still have all my stuff though.
This is my 3rd year backpack hunting. Basically a buddy and drive to a wilderness-area trailhead and hike in. Then return to the car a week later with elk.
Surprisingly there's not nearly as much overlap between "car camping" equipment and backpacking equipment.
I keep sorting through the contents of my backpack and pulling stuff out. Don't REALLY need an extra knife. Or an extra flashlight. I can wear these socks twice. I don't need lunch on Monday. Trying to eliminate every little extra ounce.
It's kind of tough, because I'm used to thinking I need a backup and a spare for a lot of things. Two is one; one is none.
Mike