In cas we use gun carts for transporting guns ammo gear stage to stage in a range environment. VERY VERY handy for such things. I built mine for about 60$ most pricey thing was the wheels.
Judt out hunting a back pack and pockets on a jacket or pants is good enough. Loaded gun one box of loose shells in various pockets the rest in the pack has always worked for me.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent
Just depends on if you want quick access and want an ability to sort your ammo or if you want it just sitting loose in a dump pouch. Maybe one of each. You could have buck shot or slugs sorted on the one panel, and your general bird shot in the dump pouch. Various bird shot sizes could also be sorted on the panel type.