I don't use a vest, but I have a May pack . 2 boxes of flies ... one wet, one dry, roughly 16 per box. 3 tippet spools, 2 with tippet, one empty. Zinger with hemostats, and nippers. A "tail knotter" tool. An Able tool. A big orange whistle. I tend to fish fairly light!! Oh, and a chamois like cloth from BP that sucks goop off a fly, or your hands. That's it!