Stored the vest away about five years ago, I just use a lanyard. On the lanyard I have a pair of Dr. Slick 4 1/2 in pliers, C&F combo tool, nippers, threader and eye cleaning needle. I also have a bottle Frogs Fanny and fake amadou. Small LED flashlight two spools of tippet material, usually 5x and something else. Two small fly boxes, one will be a nymph box, emerger box or midge. The other will be a multi compartment box for flies of the day.
Then I carry a water bottle on my belt along with my Folstaf stick and my instanet. If I am going to be hiking for a distance and away from the truck I'll carry extra drink, cheese crackers, power bar and if needed a rain parka. Very light weight, no strain on my neck or back.