I have the think tank digital holster as well as lowepro holster. The think tank may fit the 5Div, but nothing else, I mean no bracket or plate. They are amazing bags, and if you like belt holsters, they simply blow out the competition, no shoulder or backpack can compare.
the bag will do what you want, but consider either a stronger than normal belt, like one of them big jean belts, or think tank's skin belt. digital 10 will work with the popdown, 20 will work with hood reversed and hood in shooting position, popdown. Digital holster is much more compact than lowepro, has a side pocket for spare battery, and front pocket for maybe a filter. I'll use a backpack if I'm shooting around a lot of people and have a lot of gear. I'll use the full belt system when shooting with less people around like in the dark as people wont notice me 
it's totally nerdy, but you move fast and efficiently. If I do secluded hike, I'll do belt as well, I dont like being seen in public with the full belt setup, but partial, like the holster, no problem!
Sony A7siii/A7iv/ZV-1 - FE 24/1.4 - SY 24/2.8 - FE 35/2.8 - FE 50/1.8 - FE 85/1.8 - F 600/5.6 - CZ 100-300 - Tamron 17-28/2.8 - 28-75/2.8 - 28-200 RXD
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