On Sun, 27 Sep 2009 18:00:15 -0600, rw wrote:

I'll say a favorite fly box full of your favorite flies for your
favorite water. Store-bought flies, self-tied flies, friend's flies --
productive flies that you have confidence in, even if you don't know the
names or remember the lineage of most of them.

I'll say a sense of humor...

Anything else can be replaced with a lot of money and a little trouble.

Well, maybe, but I don't think so...

HTH,
R
....and in the spirit of a sense of humor, I'll also add that anyone who is
carrying so many flies astream that they cannot remember where they obtained, or
even the names of, most of them is probably being told something when they lose
them...