how well would this fit over armor?
or they should integrate armor in it. Also, its need a axe holder on the back too for the zombie apocalypse
The one I made from the Condor Mesh Hydration vest will fit. The Klim has the same adjustments. Three adjustable buckle straps on each side, three on your front. You'd have to be like 400 pounds to not fit it over you and your stuff. There is a ton of adjustment room.
I found personally that wearing it over a jacket with armor underneath or with the armor in the jacket was fine. When I tried it with a Leatt 4.5 chest protector over the jacket and the vest on top I didn't like it so much. Just a lot of things moving around with each other. But I didn't try it with vest, chest protector, jersey. That might be alright. Less bulk.
If I stripped my vest down to just the hydration bladder and big pouch I put on the back it was no problem.
I think the whole thing with it is don't put too much crap on it. My original layout has a bunch of pouches and it's better more stripped down. With less stuff on the front. I still think it is way more comfy than a hydration backpack. Especially if you don't pack rat it like I do.
In the hydro pouch on the back you could trim and fit a D30 back insert if you want.