A rule of thumb is that your pack should weigh no more than 1/3rd of your body weight, I used to walk with that amount of gear (about 65lbs) and it damn near killed me. OK you mil guys probably dream of such a light pack but whatever you are capable of if you have light gear you can go further, or alternatively carry more of it. Yes you can carry a lot more, but it stuffs your back and knees over time, although maybe that's not an issue for a one-off bug out.
So I will emphasis what Burt said, there are only three things you need to pack, lightness, lightness, and more lightness. Then when you think you have your pack as light as possible add more lightness.
These days I can go out indefinitely (in theory, the longest walk I've done is 10 days) with a pack weighing 40lbs plus water plus 1.6lbs of food (dehydes) per day. That's with a sleeping bag and mat, gas cooker, tent etc, in other words all the comforts of home
. I could reduce that possibly if I ditch the tent and use a poncho for shelter and rain and build a fire rather than have the stove, but at the expense of time, being observed (fire) and comfort. Also my tent only weighs 3.7lbs, is totally weather proof, and is self-supporting so I can pitch it on solid rock, a poncho and ground sheet probably weight almost as much. And another also, regardless of the weather I can cook in the tent's vestibule if I use the stove, no can do with a fire. That said the gas doesn't last that long so a fire is more sustainable, and fire wood doesn't weigh anything.
Hunting will reduce the food weight (assuming you are carrying a rifle anyway) but take a lot of time and effort, so whether or not that's worth it depends on if you are base camping or really have to get somewhere. It will also attract attention if you are using a large calibre rifle, not so of course with a 22 or snare.
I would add some camp shoes, just light tennis shoes or similar, it's a great morale boost to doff the heavy boots and walk around in cool shoes for the night. They are also useful when fording rivers as you really don't want to soak good boots if you can help it and bare feet are dangerous because if you react to a sharp rock or something the reaction can put you off balance.
I admit my walking to date has been recreational, a few days in the bush then home to a warm meal with a stop off at the pub on the way, a SHTF scenario will be different and I will be reviewing what I do when I get all the other things checked off my todo list, but the comments about lightness will always be valid.
EDIT:
I'll just leave this here...
Several things I wouldn't carry (chairs for example) but great graphic.
Speaking of chairs, you can always make one on site