Old fashioned lined wicker picnic basket with sandwiches, nuts, and fruit.
Paper shells loaded with nitro for my later doubles
Magtech brass hull black powder loads for my earlier doubles.
Waxed cotton vest.
I have younger dogs and have been putting a GPS locator collar on them until they will hold point for fifteen minutes which my Molly did last week. After that it is back to the old fashioned way of looking for the dog - scratch my head. I have a two collar set and on those days my shooting student Joe wood is having a near full time senior moment I put one of him just in case.
Battery booster in case the Expedition battery goes south. My main hunting buddy and shooting student Joe Wood is going senile and sometimes leaves things turned on on the truck.
First Aid Kit
A roll of stick on Velcro.
Garmin GPS for the navigating the truck.
"Roads of Texas", "Roads of Kansas", "Roads of New Mexico" and BLM maps
Gun cleaning kit
Back up doublegun to the one I am carrying.
Surgical tools for dog injuries, particulary porcupine encounters of the third kind
Spare shells in five gauges for my guests who forget theirs, I usually get about $5 per cartridge.
Spare vest for my guests that forget theirs, $50 per day rental
Spare batteries for the GPSs, walky talkys
My shooting student Joe Wood usually brings walky talkys so he can ask me what he needs to do when he gets in a jam and I am out of hearing range.
Duct tape
Spare socks
Filson waxed overalls for hunting in cold wet thorny country. In my opinion that is all they are good for.
Extra fleeces, agiain for rental to my guests
I like the Nike "Cold damp weather golf gloves" that someone on here recommende. I usually carry a spare pair.
A fluffy down filled coat. Fleece is nice but the down has insulating properties well beyone a couple of layered fleeces.
20 or thirty bottle of bottled water - in a cooler without ice
6 gallon gas can full of tap water for the dogs
The stainless steel dog bowls Walmart sells, have a rubber ring on the bottom to keep them from sliding around. One for each dog.
Dog food with measuring cup for the dogs - in a plastic container with a screwon lid.
Full tank of gas.
Duct tape, motorcycle innertubes, scissors and bandage scissors for dog boots.
Compass for the one day a season we have that it is foggy.
Rain coat.
Alleve and Aspirin for my guests, $2 per pill.
That is about half the crap I carry in my Expedition
Best,
Mike