I hope you really do not mind but I am going to add or take away some things. The kit is great and it shows you are serious about it.
That can really be lightened up a lot. I am not sure if you are looking at urban or outback or a combo of the two. Also cost can come down with the use of different firearms.
I have two similar kits I made except I bought used guns, a S&W alloy revolver and a take down trapper lever action for each kit, both use the same .357/.38 ammo and lots of ammo options.
I would opt or drop all but one of the waters and get a good small purifier (your list does not say what kind you have. A purifier or just a filter, opt for the small purifier), reuse the one bottle or at most two.
I would only have one small sterno. Your cooking times will be 5-10 minutes at a time. One can goes for 4-6 hours depending on wind and temp.
I would add a small folding hand saw of good quality (gerber has a great one).
For a 72 hour pack, I would buy lithium long life batteries and drop the solar charger and the recharge batteries, that would be more for a long term base camp. Any comms would be short and sporadic so battery life would not be the biggest concern.
You have 14" zip ties, maybe upsize them just a lil, no need for the handcuffs.
I would drop the standard MRE's and go with the Military "First Strike," meals, more calories and lighter carry, no need to heat or have dangerous carbide MRE heaters in your pack. I have seen some nasty things happen to realists (not survivalists) with those in a pack. Add a standard canteen cup. Add iodized salt, not just what is in the MRE/First Strike packs.
The crystal light packets offer no energy, I would go with "FRS," (google it) packets as they have vitamins and calories.
I would add 3 leaf sized plastic bags (you can even find the orange ones online from Halloween) that are stuffed with leaves to look like a pumpkin or stick with the black/dark green. They can be used for shelter and or water proofing/signaling. Line your pack with one and put all your stuff in it and then tie it closed.
I would add a magnesium sparking fire starter like Gerbers and others (first strike comes to mind), they work when wet. I was able to start a nice fire under a pine tree in a down pour with one made everything really cozy. When a bic gets wet, the flint will NOT work at all, same with a zippo.
Your kit is great, seriously it is. I am very much into 72 - 256 hour kits. My wife says it is an OCD LOL. My kits go from a base camp one (at a cabin in PA) all the way down to a flat two pieces of duct tape together with a needle, #11 exacto and flint/mag chips. I open up a corner of a coat and place it in there and sew it back up. I have kits all and in between those.
My one recomendation above all others is multiple redundancy in fire making....I carry matches, lighters, mag strikers, Wet Tinder, Tinder-Lite tinder, small pieces of "Fat Wood" etc and I carry them in different parts of the pack in vac sealed bags. You can get a hand or manual operated vac sealer (looks like a small bike pump and super lite, mine is a Hefty brand, but Reynolds and ohers make them) for $5 in the zip lock bag isle at a good grocery store and they really work on everything in your pack. They will also keep any fresh caught food fresh and air free until you have time to smoke or cook it.
I would also add a belt knife like a Cold Steel SRK. Nothing fancy, just something that absolutely works no matter what.
Switch the standard duct tape to "Gorillia" brand tape, it is duct tape on steroids and will stick in wet/cold/hot areas.
Instead of the shovel, get a "U-Dig-It" half the weight and just as good if not better.
Add a small but well made fishing kit (line, sinkers, hooks, flies, small bobbers, plastic maggots and small lures). Add 3 non lube condoms to it as they make perfect minow/crawdad catchers while you are doing something else at your camp and you can also carry water if need be in them, inside of a sock.
I am really iffy on the smoke grenades, there are pros and cons.
...and the best advice... practice, practice and more practice in survival skills (fire and more fire, water, food and shelter). Even when trained well, your skills get rusty. They need to be second nature.
Do a google search of "Les Stroud," and read his stuff and join his forum. Stay away from anything Bear Grylis, that man will get you killed and very fast.
I hope this helps, please feel free to PM or email me.