I have owned a couple. Most tubes are going to weigh about the same unless you get one with the solid seat. I like the looks of the teardrop shaped ones that set you a little higher out of the water. For packability, pay attention to your waders, boots and fins. Just an FYI, I have bad knees and a tube is not any fun after a couple of hours. A pontoon (heavier, less packable and more expensive) with oars is an all day fishing platform if you can get it to your water.
Thanks for the tip. I plan to strap the fins to the pack, and I always pack the waders, so the tube is all I have to worry about. I would love a pontoon and already own an inflatable canoe, but the tube must be packed for hikes of up to 6 hours so size and weight are huge. I have done a little research and have found that some tubes can weigh 14lbs, while others weigh only 8lbs.
I'm so new to fly fishing that I have no 'holes' of my own!
I do know of a handful of lakes that don't see tons of pressure, and were always productive when I would spin fish them. If you like stillwater give me a shout.