I think all fly fisherman start out with the traditional fly vest.
I like to fish PA spring creeks, a good number of years
ago I was fishing the Yellow Breeches in August.
It was a very hot day in the low 90's, but near the
stream and 55 degree spring water is was cool.
Once away from the canopy it go hot wearing a
Yellow Breeches Orvis Shop I purchased a chest pack.
I liked it from the first time I wore it.
Couple of years later I purchased this Richardson Chest Box.
Bottom drawer is large enoough to just carry the minimal
I have the Joe Humphrieys model and wouldn't ever
go back to trout fishing with just a vest.
Mr. Humphreys' does at times wear a vest with his
Carry midges, nymphs on one tray
Dry flies on another
What I like most is that I travel from freestone stream
to a spring creek and able to just swap out cards.