I probably can't help much for organization, it was never my strong suit. But when I was a tech I had an "inside bag" and an "outside bag." They were just plain canvas totes.
The "outside bag" was for stuff like masonry bits, cable clips, silicone sealant, grounding wire and lugs, closures, mounting screws, conduit cutters, conduit brackets, grommets,
telescoping wire grabbers, etc. Plus some PPE for doing work in a crawlspace or unfinished basement. My job involved running cable from the roadside to the building, so maybe that won't be part of your work. The idea was I'd do the outside work necessary to hook up a customer's building with this, then take it back to the truck and swap it for the inside bag to do the interior work.
The "inside bag" had stuff for interior wiring like keystones, jacks, surface-mount closures, punchdown tools, drywall saw, Cat5 and coax crimpers, Cat5 tips and Coax F-connectors, smaller mounting screws, some stiff wire (usually trimmed grounding wire) in like 30cm lengths for ad-hoc wire fishing, a dust brush and dust pan, stuff like that. But I didn't do a lot of work inside smart panels or real wiring closets, I was mostly going from the outside demarcation point to the modem location and maybe a few wires for IP TV. Any scraps like wire strippings or dust from drilling got swept up into one of my discarded plastic bags (the CPE came wrapped in these) and rolled up, tossed into my bag, and taken out at the end of the job to dump out back at the garage.
I had a second "inside bag" just for carrying CPE (modems, IPTV receivers, remote controls, printed channel guides, etc.) Each bag was cleaned out and re-stocked at the end of each day so I could just grab-and-go when on a job.
On my toolbelt I had my no-contact voltage detector, tone probe, tone generators (the test leads made a nice loop to hang them from), wire cutters, Kevlar snips, a real impact punchdown tool and puck,
a cheap stripping/punchdown tool as a backup, combination
needle-nose and butt-connector crimper pliers, electrical tape, screwdriver, plus the various drivers and can wrenches I needed to access our closures. Whether doing inside or outside work, I would always need at least some of this stuff handy. Also kept a small bag each of F-connectors, Cat5 tips, and butt connectors just in case. We had small plastic high-visibility tags for labeling a customer's service lines, so I carried a bunch of those as well as an all-weather Sharpie in my pockets. They could probably have been in a compartment on my belt if I had more room, though.
You probably won't be working aloft at utility poles but I had a special canvas bucket/bag just for that, which would clip to my safety belt. I had the hardware for hanging "drop" (the cable that carries service from a pole to a building) in there and I'd also chuck in a few essentials from my tool belt like the voltage detector.
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