It seems Mac was a minimalist- despite the image he has of being the guy who carries a hardware store in his pocket. The first step to thinking like Mac when loading up is keep it to a minimum. He never used the largest Swiss Army Knife (SAK) you can buy, or a fanny pack full of goodies. So, step one is to keep it light and basic.
A second principle was always having a SAK, duct tape, and a watch. The watch anyone needs, the duct tape is infinitely versatile, and likewise for SAKs. As he could plan ahead he would take more, so it's obvious he was adaptable. If you seem to need string a lot, or lock picks (let's hope not
) or anything else, you could incorporate it into what you carry around. Just be real with yourself about whether you ever would need 1 sq. ft. of aluminum foil folded up in your wallet.A third principle was each item had multiple uses. The watch became a magnifier, the knife became a lock pick, and the matches could become a timer. So if you add things, especially bulky things, to what you carry around, then make sure the items are worth their space in gold. He always wore a belt, too, and it came in handy more than once.
All that being said, I don't think it's un-MacGyver-like to carry a cell phone (calculator/phone/etc.) or a notepad, but it surprises me when people think they are MacGyver for weighing them down with a ton of worthless gear. I guess the big no-nos would be wearing stuff on your belt and having so much in your pockets you can't quickly get to any particular thing you might need.
I personally just go with a SAK, some flattened-out duct tape, a watch, cell phone, and an LED pinch light on my keychain. My wallet is a thin ID type that just has cards and cash in it. Other ideas I've had in the past included paper clips on the keychain, a rolled up 25 ft. + piece of string, jumper leads with alligator clips on both ends, matches, lock picks (or a compact lockpick tool), a hankerchief (from flame's end) and folded aluminum foil. I could see a USB drive being useful as well, it just all boils down to your daily needs. Oh, and only carry high quality products, Victorinox, 3M, Diamond, Photon, etc. The last thing you want is a knock-off SAK breaking off in a screwhead!
MacGyver also had extensive knowledge that backed up the use of everything he had. A basic understanding of metals, chemistry (not my strong point), automotive systems, basic electrical info, and skills like lockpicking all complemented his gear well. And, for me, being hands-on was always the best way to learn. With most things, you can usually acquire cheaply things to practice building skills on. Hammering, welding, and bending metal, lockpicking, practicing electrical wiring with low current DC, etc. all are easy to do and cost little more than your time. This knowledge contributes to having the right mental mindset and approach: "Odds are, I can use what I have and the things around me to improve this situation. Every physical thing can change state and might be useful." MacGyver never had to think about that- it was just his M.O. Think outside the box, look beyond the obvious purpose of an object and break it down to its properties.
So, if you call yourself more than a fan and seem to actually live out the life of Mac, being equipped mentally and physically both are crucial. Try to get the most out of the least amount of pocket junk. And if you really want to be extra prepared, you can expand to a bag of "sometimes items" and keep it in your car. Hopefully it will be close enough most of the time you won't ever be left out to dry. Mac obviously had a crew standing by with what he needed for the next scene- wouldn't that be nice?
So remember, keep it light, try to carry items with multiple uses, and adapt to what you do and don't need.
Any input from other everyday Macs would be valuable too- I'd love to hear what others are doing! I also would love to https://www.macgyveronline.com/shop/book-store/!
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) I noticed you have some pretty high security keys. And that is a very nice SAK choice, you are a man after Rocky's own heart 
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But still I cannot imagine having that much trouble keeping track of knives. 
And just like MacGyver, I decided to carry it everywhere. After all that's why I bought it. I carried it to school (never intending to use there), which in my school ( it's a private school) if you leave it in your bookbag, purse, or car and don't take it out it will usually go unnoticed. It went well for a few days until my Mom found out and almost took my head off! 
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Clip it on your belt or something.
I agree with these sentiments...
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Welcome to the site.
So cooooool! 
's sake, the 9/11 hijackers took a plane with box cutters! You know what approximates the cutting edge of a box cutter? A sharpened quarter!
