Probably not, TBH. Though these things are highly situational. When every job you do is “bespoke”, you rent the gear appropriate to that task.
Is the assignment fashion runway stuff? Or sports? Or concerts? Or news? Or documentary? Public affairs? Or theatrical film? Every one of those jobs has different demands. No one rig serves them all, equally well.
My experience is mostly in ENG work these days. A lot of shooters in the news biz I see, use DeJero , Live Vu or similar back packs to livecast their shots back to base in real time. They are not that happy having to tie the camera down to a backpack (nobody “wears” them.) They’re awkward to wear while hand-held shooting off the shoulder, so they tend to be dropped at the foot of a tripod, with an SDI extension cable, and now your camera is tethered. I have NEVER witnessed an ENG shooter actually wearing the backpack while shooting… ever. So far. There are a million little moments when a shooter might need to bend down or step away from the camera and/or tripod for just a second or two – and an umbilical to his or her body makes that a problem. If you see something potentially interesting developing away from the tripod, or a fun/a artsy cut-away opportunity, wanna unhook and go get it, you have to weigh the risk of leaving the expensive backpack unattended, or dragging it along… you may tend to not bother trying to find that unique shot, and sticking to the tripod, just because it’s less hassle… it’s just not ideal.
My current rig for work uses a Terradek Bond that’s small and clips on between the Anton Baur battery pack and the camera’s battery plate. It adds negligible weight and affects the balance just a little, offset by the LED mini light near the lens… but at least there’s no cable to hang up on anything or trip me. I can go anywhere with the P2 camera and the Bond on the back, in seconds. Particularly when running wireless audio. And that’s damn handy sometimes.
Terradek doesn’t make those anymore, to my regret; they’ve gone to a backpack solution that promises higher transmit power, less needed bandwidth, and better hot-swap-ability. To me, it’s one more separate damn thing to haul around, when I could leave the old unit on the camera and forget about it, leaving me just two things to carry: the camera, and the sticks.
I get it that you’re talking something smaller than a backpack, more like a fanny pack or audio guy’s mixer bag… …or the bandoliers of lead-acid or NiCad batteries I used to haul, looking like Chewbacca, in the 80’s… But IMO, to make something space-efficient for a bag that size, you’re already miniaturizing enough stuff that it may as well still hang off the camera or plate, skipping the umbilical.
And heavy fanny packs tend to pull one’s pants down. I know. Between a fanny or belly pack, and a bandolier, I’d take the bandolier. A bandolier also puts a potential connect point right at the shoulder; shorter, and away from places that can snag.
Maybe a better invention would be an evolved camera plate that had break-away magnetic quick-connect/disconnects to the camera’s inputs and outputs, so you can stash a larger battery and storage drive and audio mixer on the pan head/plate. There are already camera grips that combine some or all these features…
Or a sophisticated, clamp-on cage that would manage all the battery/mixer/backup drive gak on a monopod, leaving the smaller camera free to attach or detach with a break-away connection… Zacuto’s probably made one already and I just didn’t notice it yet…
Good luck on your idea. Do consider the bandolier, though. More ergonomic weight distribution, and easier sizing.