This is the basic kit that we always have with us in the field.
Our deluxe garden tool belt holds all my kit and is the best gardening gear investment I've ever made: it holds my multi-purpose hori hori, a pair of secateurs, snips and a folding pruning saw.
With all my main tools on my body, I never misplace them. And I almost always have what I need with me, minimizing trips back and forth to the truck.
I always keep a cleaning block and a small sharpening tool in a pocket or pouch so that I can give my secateurs a quick clean and sharpen as needed. There's also room to tuck the phone in there too!