All of the above items in the first 2 posts except the umbrella (I didn't get an umbrella gifted to me!). I need to look at the 3rd post more carefully I may add to what I carry. I also have a first aid kit. It includes 2x2s, 4x4s, rolls of gauze, trauma pads, band-aids, oral and nasopharyngeal airways, adult and pediatric bag valve masks, stethoscope, micro pulse oximeter, glucometer, 2 admins of oral glucose, instant ice bags, cravats, splint boards, trauma scissors, BP cuff, penlight, pens, notepad, disposable gloves, n95 masks, biohazard bag, emergency blanket, knife, multi-tool, window punch, seat belt cutter, eye protection, flashlight, medical tape, open chest injury seals, tourniquet, SAM splints, and other hemostatic dressings. All of this in a small personal medical bag.
O yeah, I am an EMT so this might be overkill for most folks :--) I always carry my fluorescent reflecting heavy EMS jacket for visibility on highway if needed. I used to have a few old school flares but have since used them on incidents and it is 2018 so I'll probably get bright LED warning triangle or collapsible cones. More eco-friendly!
I also purchased this vacuum which I carry with me and I love it.
https://www.amazon.com/gp/product/B0748QCKZ5/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
The EMS bag and jacket, and vacuum, and microfiber towels / small bottles glass cleaner and wax polish / cleaner, are all in the storage area below back deck using this:
RPM Tesla
I have another one of those storage organizers in the frunk that carries the stuff the car came with, plus a Evannex pet mat,