The Mayfly pack holds a couple small fly boxes, and any necessary tools. Combine that wiith the Filson fanny pack (that I wear over a hip...the fanny is big enough, thank you!). The best of both worlds, everything possible is handy, nothing to interfere with casting, and if needed, a jacket or rain poncho can be folded over the web belt of the fanny pack and worn behind you. Haven't worn a vest since I fell in and all the pockets filled with water, adding about a thousand puonds to the vest.

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Trouts don't live in ugly places