If I were getting a tacticool vibes bag today the top of my list would be the Mystery Ranch Blitz 30 or 2-day assault. It's almost certain to fit better since it has an adjustable yoke and comes in two torso sizes, plus MR's harnesses ares just better overall IMO. However, the internal organization on their bags doesn't suit everyone.
Hill People Gear also worth a look, that's probably a bit more BIFL these days.
For a bag with a lot of organization, people really love the Tom Bihn Synik/Synapse, and they have a great reputation for durability.
Edit: I also think Inside Line Equipment bags are criminally underrated among boxy bags with simple but beefy straps. I think for a "onebag" there's a lot to be said for something like their Race Day or Travel Pack. If speed of access/packing isn't a priority, oldschool messenger makers like Re:Load bags also a good option.
It looks like you're focusing on prebuilt boards. Most ergo mechs are sold as DIY kits with a fair amount of soldering required, and for keywell boards it's very common for them to be fully handwired.
You can also buy assembled keywell boards, for example from bastardkb and there are a few folks who build dactyls for sale. These options will probably be relatively expensive as they are basically handmade by one person.
Flat ergo boards will be cheaper in general than keywell ones. If they have a tenting option and you use keycaps with a strong sculpt like SA or MT3, that might get you a fair bit of the way towards keywell functionality. But you'll still need to find a good layout for you (which is totally personal).
https://www.flickr.com/photos/kukkurovaca/52064906373/in/photolist-2njNfKx-2oBeHCK-2njQEqG
It will be somewhat easier to find fully assembled or easy-to-assemble flat ergo boards, like the Keebio Iris or Boardsource Lulu.