Good one. I'll play.

Nothing terribly extravagant comes to mind. My best is probably a pouch of pretty decent spey flies from the Hoh that I found after we pulled over to land a king.

Now if you had asked what is the best thing you have LOST on the river, I could come up with a pretty long list!
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I am still not a cop.

EZ Thread Yarn Balls

"I don't care how you catch them, as long as you treat them well and with respect." Lani Waller in "A Steelheader's Way."