what Ive found is the more time I spend in the field the less I realize I actually need so subsequently the more I leave at home
on my person I carry a belt Knife, PSK(with a SAK included, med kit, fire kit , signal kit etc), a folder knife, map, compass, GPS, insect repellant, and a water bottle and thats it.
I know with the items on my belt I could survive for days, maybe weeks if I really had to.
In my pack I carry, food, cooking gear, shelter, sleeping gear, hatchet, folding saw etc.
everything in my pack is a just there to make my life comfortable in the field, if I lost my pack I would still be able to survive with the gear on my belt, So its not vital.
I like the theory of the redundancy system but I cant be stuffed carrying shit I dont use, if its not used it gets left at home.
when I first started out I would carry alsorts of extra crap I didnt use but I carried it with the thought of what if something happened in the back of my mind. I then started hiking and hunting with some old bushmen, and they looked at all my fancy kit and extra knives and just laughed, these guys would be in the bush for five minutes and have the Hilton built and a good dinner on before you could blink an eye with what we consider the bare minimum of kit.
the point is what we think we need and carry can be very different to what we actually need and carry.