Since you mentioned a backpack, may I suggest adding a few items? These may be in your "EDC pool" already.True EDC items are my keys w/E01v2, phone, wallet & Cold Steel SR1Lite or vintage Voyager. Next up is gun of the day, 75b, G2C or 586, usually w/a reload[or2]. If you've never seen me w/o pants you've never seem me w/o at least these with me.
One[or more] of over 30 different flashlights gets added next, usually an Emisar D4k duel channel. If I'm dressing up a D4v2Ti is a common choice as is a FW3aCu. If I know it's going to be a long day into night the EDC light might be back up for a D1/E70mini pairing.
Next we have the multi tool &/or pocket knife. Leatherman & Swiss Army rule this group. The Wave+ & Cybertool34 the most common picks out of over 20 or so. Last is the backpack: 550 cord, 1st aid kit, 6k/mah battery pak w/cables, Sofirn SC31pro, Berkey water bottle, GPS, umbrella, pens, pencils, markers +paper; then added needs for the day.
EDC is really a state of mind than an item(s). I have an EDC pool that is mix n match dependent on the day & planned events. This was taught to me by my Dad, Grandpa & the Boy Scouts. Over the last 50+ years the things/items have changed but not the mind set
-toilet paper (small compact camper-type)
-Pocket pack of Kleenex
-Wet Ones pocket pack
-Tide Stain Treatment pen/stick
-Tiny sewing/repair kit
-Eyeglasses repair kit and lens wipes if you wear glasses
-Small hygiene kit w/razor, extra blades, shaving soap or cream, styptic pencil, stick deodorant, sample size tube of toothpaste, tooth brush, after shave lotion or cologne, washcloth and small hand towel small bar of soap.
-Pair of socks, type chosen depending on climate and season
-Change of underwear
-Hat or cap
-A couple of N95 respirators
-A pair of safety glasses and/or goggles
-Three pair high NR ear plugs
-Three pair Nitrile gloves
-Pair of leather work gloves
-Pistol cleaning kit
-Portable AM/FM/WX radio
-Scanner radio and/or dual-band Ham HT w/batteries
-Bandanna or shemagh https://thesurvivaljournal.com/shemagh/
-A fixed blade survival knife if local regulations permit, w/sharpening tool
-A coil of steel wire, suitable for wiring things in place or making snares
-A small assortment of fasteners, nails, screws, nuts and bolts.
-A small "fishing kit" with hook, line and sinker.
On your key chain or in pants pocket may I suggest adding a key chain size OC. I buy Sabre Red products, they are Made in the USA in Missouri. https://www.sabrered.com/pepper-spray-and-personal-safety-products Hopefully this will prevent having to use lethal force.
ETA: I FORGOT THE MOST IMPORTANT THINGS OF ALL! DUCT TAPE AND WD40!