it seems that the guys with the most stuff seem to catch all the fish.
It’s funny you mention this, because I’d always thought the exact opposite. Rather than becoming a mobile tackle shop, I’d recommend keeping it minimal. Unless you’re fishing technical waters that require a great assortment of flies and tackle, I’d keep it down to the bare essentials.
These days I’m rotating between wearing a Fishpond hip pack and wearing a Granite Gear backpack with water-resistant zippers. I use the backpack if I need to carry a jacket and my DSLR, and the hip pack if I’m going lean and mean. Fly boxes go in my shirt pocket or the pocket in my waders.
Less is more, unless it isn’t… in which case, more is more.