Daaaaaaannnnnnngggg...
Maybe you're a hiker, and maybe you're not, but if you are one... we personally have very different hiking capabilities and preferences. If you aren't one, I
HIGHLY suggest covering about a hundred miles on foot in about a week sometime. It'll be an eye opener, I promise.
I bet the first thing you'll notice is that you probably don't need six cans of sterno, maybe not even need any at all. And you'll also notice that carrying useless weight is a no-go. It slows you down, makes you tired, and can cause injuries.
As for the first aid... I have a kit in my pack always, and it weighs less than two pounds. The minor injuries package is separate and not as easily accessible. It only weighs a few ounces... a few assorted band aids, light painkillers(NOT ASPRIN, it thins the blood), anti-diarrhea and anti vomiting capsules, a few Benadryl tablets, a little gauze, antibacterial, a couple of alcohol wipes, duct tape, and some moleskin. That's it. My major injuries kit is slightly heavier and kept where I can get to it quick. It has more gauze, athletic tape, an ace bandage, butterfly strips, and Celox for SERIOUS bleeding only(I thought about getting an Epi-Pen for it, but I'm not allergic to anything). This little kit is plenty for pretty much anything that won't kill me immediately. Broken bones, bad allergies, arterial bleeding, stomach illness... it's enough to stabilize pretty much anything from a bee sting to a gunshot wound and it's only a couple of pounds. No sense in carrying five pounds of band aids and Tylenol for minor scrapes.
I'm an experienced hiker, and I've got plenty more suggestions for changes if it were my pack... but it ain't. It's yours. Just trying to make sure you don't get thought of as that guy with more money than sense.
Oh, there's a lot of stuff that I wouldn't personally carry in your pack, but I feel there's some things that are important that you add... these aren't just personal opinion, these suggestions are probably going to be pretty much universal...That is not enough water. I'd personally add a couple more full bottles of water and a couple more empty ones in case you know you won't be passing any water for a day or so. Eight full bottles of water should be plenty enough to get you to another water source unless you're in a desert. Also, I see no rain protection. It doesn't have to be much, but a rain fly and string to sleep under would make life a lot happier when the weather sucks.
And you say you're making four of them, does that mean for a wife and kids? The wife and kids are not going to be able to walk far with 50 pound packs... sorry. Take that exact pack and spend just one night in the woods with it, and you'll see some glaring oversights and a lot of redundancy ( pepper spray and pistol, zip ties and handcuffs, ten bic lighters).