I fish some team tournaments with a buddy and we use his boat, I bring 5 or 6 depending on where we're going. Typically with 3 casting and 2 spinning I can cover almost any technique, maybe not perfectly but at least pretty well. If I bring a 6th it's specific to that particular lake (like my spybait/hairjig rod). I usually pack a couple of extra reels though too just in case I get one of those day ending backlashes, need to change line size or technique.