I can't at the moment recall who it was I was talking to about this. There was some thread somewhere about what people carried in their "trunk", and how.
@stupidchicken03 @Doca .
So contents of the trunk, a T-wrench, recovery strap, shackles, lug nuts, the bag has jumper cables, first aid kit, new jumper pack (which obsoletes the cables, but whatever) tire gauge, flashlight, rain ponchoes. emergency blanket, scraps of rope, ratchet straps, window cleaner, various tools, red flag, matches, fuses, this and that.
That brings this up is that the suitcase I had containing all this, the zipper broke. So I came up with another one. Not blue to match the car this time, but it was available. And it tucks in tight under the cargo cover bar. So doesn't take up too much space.