Every guy has an EDC (every day carry), be it just a wallet and keys, knife or multi-tool, pen, shurikens, whatever. This is my EDC, it's small and simple and May be expanded later but it does everything I need it to. I'll explain everything as I go along.
Step 1: Belt
One leather belt. I'm a larger guy so I tend to like the double buckle with holes along the whole length of the belt. If worse came to worse it can be used as a tension strap, tourniquet, or cordage for a splint. It also holds up my pants and allows me to clip on other tools and such. I also tend to always wear a hat. Above is the hat du jour.
Step 2: Pedometer
It's not essential but I have it on to count my steps and help me track my exercise. If you were lost you could reset it so that you track how far you might move in any direction to find or signal for help.
Step 3: ID and Money Clip
My access card for work is on a spring-loaded retractable belt clip with about 24"-36" of string This can be used as cordage or snare wire for small game. My money clip is the Smart Money clip from Storis. You can find it on amazon.com starting @ $20. (https://www.amazon.com/dp/B001RMO3NK/ref=cm_sw_r_udp_awd_wEuCtb0DS7BVNA8F) My money clip holds all of my other ID and cash. I have my insurance cards, credit cards, organ donor and blood donor cards as well as random gift cards. The clip is stainless steel and can be polished to a reflective surface. This particular clip is made to hold 5-6 cards in the holder as well as in the clip with cash. I would also like to find a credit card size Fresnel Magnifier as a fire starter if needed.
Step 4: Left Pocket
This is pretty straight forward. I have my business card case and a PNY 4Gb flash drive.
Step 5: Keys
My keys are always clipped to the belt loop closest to my front pocket. I have my car key, house key, mailbox key, and a key to a lockbox for other things to be hidden away. I also keep a Streamlight Nano Flashlight for emergencies and two 0.5 black s-biners from my broken paracord bracelet.
Step 6: Right Pocket (the Most Important Tools)
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First of all is my IPhone(not pictured). It actually belongs in the Carpenter's pocket of my jeans when not in use. Next is the Streamlight Twin Task LED flashlight. It's a 3 AAA aluminum, weather resistant flashlight with 5 modes. Laser, 5 bright LEDs, laser and LEDs, single LED(UV maybe?), and off(club). I recently swapped this bulky light out for the Streamlight Micro LED flashlight. This one is a single AAA LED light that is surprisingly bright. There's two things I love about this light. First, it's smaller, uses fewer batteries, just about as bright, and has a reversible belt clip. The clip is S-shaped so that it can clip to a hat and become a headlamp. (Love it). The knife is the Leatherman Crater. It is a 4" straight/serrated combo blade in black oxide. I also has a Phillips and Flat screwdriver and a caribiner that doubles as a bottle opener. I ALWAYS try to keep a pen on me at all times. My writing instrument of choice is the Zebra Z-301 Bold. It's a stainless steel pen with a (1.6mm)med point tip. The larger roller allows for a smother stroke and I happen to find it more comfortable and durable than other pens.
Step 7: Bandana
Here is an entry from chapter 3 of "Hitchhikers Guide to the Galaxy" regarding towels.
A towel, it says, is about the most massively useful thing an interstellar hitchhiker can have. Partly it has great practical value. You can wrap it around you for warmth as you bound across the cold moons of Jaglan Beta; you can lie on it on the brilliant marble-sanded beaches of Santraginus V, inhaling the heady sea vapours; you can sleep under it beneath the stars which shine so redly on the desert world of Kakrafoon; use it to sail a miniraft down the slow heavy River Moth; wet it for use in hand-to-hand-combat; wrap it round your head to ward off noxious fumes or avoid the gaze of the Ravenous Bugblatter Beast of Traal (such a mind-bogglingly stupid animal, it assumes that if you can't see it, it can't see you); you can wave your towel in emergencies as a distress signal, and of course dry yourself off with it if it still seems to be clean enough.
More importantly, a towel has immense psychological value. For some reason, if a strag (strag: non-hitch hiker) discovers that a hitchhiker has his towel with him, he will automatically assume that he is also in possession of a toothbrush, face flannel, soap, tin of biscuits, flask, compass, map, ball of string, gnat spray, wet weather gear, space suit etc., etc. Furthermore, the strag will then happily lend the hitch hiker any of these or a dozen other items that the hitch hiker might accidentally have "lost." What the strag will think is that any man who can hitch the length and breadth of the galaxy, rough it, slum it, struggle against terrible odds, win through, and still knows where his towel is, is clearly a man to be reckoned with.
Seeing as how silly one would look with a beach towel hanging out of a pocket, I believe a bandana is the next best thing. Larger is better as long as it doesn't get in the way. Typically most bandanas are 18x18 or 24x24. Sure it's smaller than a towel but can do just about as much.