I don't own one, but I'm curious why/when you would want to fish while wearing a full back pack? I usually pack my stuff in, set up camp, then go fish. If I fish on the hike in or the hike out, I drop my backpack by the side of the creek before I fish.

It just seems odd to me to have a full-on backpack that doubles as a fishing vest.

I've got Bean's "rapid river" vest pack (which I love), and that's about as big as I'd want to wear when fishing. I can't imagine wanting to fish wearing a full internal frame backpack.

http://www.llbean.com/webapp/wcs/stores ... at=8169-tn

I wonder if you'd be better off seperating out the functions of backpack and vest. For overnight trips, I'd use a regular backpack, and carry along a William Joseph ultralight chest pack (less than 5 ounces) to fish with when you get to your fishing spot.