I have 2 ammo cans: one for hunting, one for the range. The range can is the larger and is no problem to take. I bring the hunting can for the van. While I am in the field I hunt fairly compact, usually taking only 5 extra loads in addition to the one in the gun, a 9 primer block for a pocket and another for another pocket, a short bullet starter, and a plastic tube about 4" long with a piece of fine piano wire to poke out breech plug flash holes along with a drill bit to clean flash channels. And my knife. What more I could possibly need I can fit into coat pockets or my day pack.
I hunt a very small parcel of private land [11 acres] and it has a vertical rise of 470 feet from the house to the stand. I follow what amounts to be switchbacks to climb this hill and the ascent takes roughly 45 minutes. The rifle is on a sling and the pistol is holstered so hands are free. The binos are tucked inside whatever coat/jacket I am wearing to keep out of the way while going up.
This project bag looks like something fun for the traditionalist or purist hunters/shooters to pursue but for me hunting "practically" is paramount. At 67 I have too many things that I may need my hands for when I am climbing that hill and a bag like that swinging around just isn't going to happen. The utility side of the bag I can clearly see and I don't want to sound like I am knocking the project. I did mention the two ammo boxes for my hunting and range goodies....these just keep me organized and whatever I keep inside I am assured is safe and protected from the bumps and knocks that would happen with a bag full of the same stuff hanging in the closet.