I always enjoy your writing Brian. It's very interesting to me to think about how different the same the concept can be by location. I'm in a unique enough part of the world where I could readily use your winter suggestions in the afternoon and be enjoying the sunshine by the pool only a few hours later. We keep packs in all our vehicles, however our focus is normally on shade and water. I also resupply mine regularly, as the 150-170+ heat in the summers kills the supplies super quick. I'm spoiled now with he drawer system in the FJ and have a hard time slimming things down if I were to need to hump the basics any distance. For the most part it would be as much water as I can carry and a small ditty-bag (homage to Sears). Speaking of, what's the med kit pouch shown? I've been a fan of the TAD OP1 for a while now. I'm not a TAD fanboy, but it's just so functional for its size. Mine lives in the bottom of my daily work bag and carries the following:
Reflective thermal blanket
Compass, signal mirror
Water purification tabs
Collapsible water bladder
a few folded Qt ziplocks
Space pen, mini sharpie
Waterproof writing paper
Brightly colored flagging material
Bic lighter, secondary fire source (magnesium block)
Tinder in a waterproof container
Headlamp, extra 3A batteries
Mini flashlight
Small multi tool
Whistle
Aspirin, Ibuprophen, Benadryl, Neosporin, Iodine wipes, tweezers, surgical glue, band-aids, mole skin, roll of dental floss
Needle and thread, safety pins
Mini roll of 100 mph tape
and a folding titanium spork