2-3 Large trash bags, the item at the bottom left is a knit cap for my head. I should throw some wool socks, and a small blanket.
Good kit!
Just ignore if I overlooked something. I would:
Separate the tools in a shaving kit - leave it behind if you leave your truck.
Add (nothing critical or expensive):
tinder, like cotton balls/vaseline
leather gloves
Fleece blanket
T.P.
For winter:
rain pants
sweater
For summer:
mosquito headnet
water/gatorade (commercially packed-drink and toss)