I carry a whole bunch of stuff in a large pack that stays in the car. Depending on the hunt I will take out what I will need. Regardless, I always carry: bow and quiver of 3 arrows, in the quiver there is a pouch for an extra string and some string wax, tags, TP, keys, knife, lighter, hat, bear spray and some rope. If I am just walking down a gated logging road (less than 3/4 mile maybe) this (and probebly some water) is all I take. If I am going much further other things that I may take are my emergency kit (a 5x2x6 inch soft packet with first aid kit, fishing kit, firestarting kit, 2 snares, some cordage, aluminum foil, a granola bar and chocolate, plastic bag, space blanket, water purifying tablets, flagging tape, boot laces, small knife and a little extra TP), extra socks, a wool sweater, food such as jerky or dried fruit, map/s and water.
I personaly feel that no one should go anywhere in western Montana without a knife, a fire starter, some water and extra clothes.