The list author says: "Plenty of these out there. I'm bored and figured I would throw in my two cents. Some of these items are intended to represent a general type of item (ie multitools - leatherman, gerber...pick your favorite). Also, I would recommend trying a few things that you can't just buy online. Try making pemmican - amazing long-burning fuel for a body on the go. I also think it goes without saying that if you have things that need batteries, bring extra, or get rechargable and a solar charger that can meet your needs. I'm going to leave out firearms - if you are a gun person, you probably already have your picks and reasons for them. If you are not a gun person, start learning now or plan on doing without. Also for this kit you will want good, broken in shoes/boots, extra clothes (at least one change of socks, underwear, and tshirt), sunglasses, a hat to keep the sun off, and a compact hygeine kit with soap, toothbrush & paste, a camp towel, nail clippers, small scissors, comb, etc. I would also highly recommend sunblock, insect repellent and a no-see-um net for your head. If you have room and are willing to carry the weight, throw in a few lickies and chewies, booze and smokes (useful for trading) or a favorite book."
"Not a full blown shovel (or even E-tool), but what the hell kind of digging to you expect to be doing? You're probably not going to need to dig a foxhole, but you might want to dig a firepit or cathole, or move coals around in your fire. Lightweight and does the job."
"Workable emergency shelter. If not this, then get some kind of tarp and look up ways to use it as a shelter. Hint: if it's cold, set it up and fill the insides with material for insulation (dry leaves, pine needles, squirrels...whatever)."
"If you get a pair you can coordinate with team members. If you are alone, you can monitor for others who may be trying to contact the outside world. Since they run on batteries, you might want to find a small solar charger that can handle AA batteries (this would also necessitate rechargeable batteries)."
"Again, this serves as an example of a product that would be useful. Think of it this way - your absolute must-have stuff goes in your pockets. Items next in line on the "important stuff" chain go in here. The bulk of your stuff goes in your pack. Besides, you don't want to have to dig in your backpack everytime you want a granola bar or need to check your compass."