Mini van here, so no trunk, but the cargo area behind the 3rd row seat has the following..... car emergency kit, blanket, and a car organizer containing a first aid kit, a few granola bars, and an ice scraper.
The third row seat (which usually stays in the garage but got put in the car last week by DH for some reason) has a bag of hand-me-downs for someone at church, a bag for the Goodwill, and two snack trays for the kids to use when we go to DC in two weeks. ..........................P