For almost all my trouting I need my Orvis Vest , so much a part of my way of fishing,everything where it always is ,so can find things with my eyes closed.
When Summer salmon fishing I have a tiny holds a Wheatly over the neck pack Adam sold me years ago, with a Wheatley some tippet a spare leader/poly tip,snips and forceps,/haemostats I am good to go !
That does not mean thats everything as the Trunk of the car is stilll a travelling tackle shop.