If you're fishing streams, Tenkara is the way to go for backpacking IMHO. By not having to use a reel and heavy rod tube, you save a lot of weight. But if you need to boom out long casts on lakes you would probably want a conventional fly rod. What type of fishing are you doing?
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Gear Talk There's no such thing as having too many sporks!

Backpack Flyfishing Tight lines,light packs