I have both spin/bait fished as well as fly fished while bp. Nowadays I exclusively fly fish. I catch as many and usually more than before but it is my choice and you have to make your own. That being said just about any fly rod with an aluminum or graphite reel does not weigh that much and the same with any ultra light spin setup.If you want to save a few grams then lose the case. I have always taken a fishing rod with me if there is even a remote possiblity of a chance to fish.With the rare exception of a day hike with a 9' two piece rod, I never use a case more that the cloth bag the rod came in. My current standby is an 8 1/2 ft 5 wt 4 piece rod. I have never broken a rod while packing. I just strap it along side of the outside of the pack and take care not to drop the pack on it. For me fishing is a big part of my backpacking experience(not all) . I think whatever you are comfortable and have the best experience fishing with, you should take. Leave the saltwater tackle home. <img src="/forums/images/graemlins/grin.gif" alt="" /> Any extra lttle weight will be tolerated if you enjoy the fishing rather than not be able to fish the way you want because of inferior or second choice gear.
Good luck and tight lines